Predator 3500 Watt Inverter - Generator - Extended run time - Power Equipment Forum : Power Equipment Forums
User Tag List

 3Likes
Reply
 
LinkBack Thread Tools
post #1 of 13 (permalink) Old 09-23-2018, 07:52 PM Thread Starter
Junior Member
 
Join Date: Sep 2018
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Exclamation Predator 3500 Watt Inverter - Generator - Extended run time

We've recently purchased a new Predator 3500 Watt Inverter/Generator and I'm looking for a way to extend the run time of the fuel tank for longer camping trips. I've found the IPI Industries Breeze Extended Run Generator System — BERG System: Single Feed, Model# HND1.2-000iS, however I cannot find any lists that say if it will or will not work. Either way, if anyone has any idea of direction for what I could use, I would be most thankful.
Gotcha is offline  
Sponsored Links
Advertisement
 
post #2 of 13 (permalink) Old 09-23-2018, 08:36 PM
Senior Member
 
Join Date: Aug 2018
Location: Lowell area, MA
Posts: 159
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
I certainly wouldn't make any assumptions about a different kit working. My 2000W Honda uses a fuel pump, for instance, so I had a little more options when I made my external tank. It will pull fuel through the line, from the external tank.

But for gravity-fed carbs (which seems to be the Predator 3500W type), it gets a little more difficult. The tank needs to sit above the height of the generator, for instance.

This kit (about $200, shipped) says it's for the 3500W Predator, as a ready-to-go option:
https://www.ebay.com/itm/PREDATOR-35...-/112504174713

You can also buy just a cap:

eBay

But you'd need to supply your own tank, fuel lines, etc. Small outboard-motor gas tanks are often used.

Have you contacted IPI Industries, the people who make the BERG systems? They could probably tell you if they make something compatible with the 3500W.

https://ipiindustries.com/contact-us

I got a used 6-gallon outboard tank for my setup. I modified an original Honda gas cap, to add a barbed connection for a 1/4" fuel line (found 1/4" rubber fuel line cheap at Lowes, in the plumbing section of all places). I put a quick-disconnect on the fuel line between the cap and the tank. And the tank's primer bulb lets me fill the tank->generator line with gas before starting. With 7 total gallons available, it can run my EU2000i for 28-70 hours, based on Honda's statement of 4-10 hours/gallon, based on electrical load. It was a bit of a project to rig up, but it's a nice capability, and will let it easily run overnight if needed, without worrying about running out of gas.
RedOctobyr is online now  
post #3 of 13 (permalink) Old 04-24-2019, 06:36 PM
Junior Member
 
Join Date: Jul 2018
Posts: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
An inproperly rigged Extended Run setup can be problematical. Here's my take; correct me if I have anything wrong. Hope this helps:


There is a troublesome Harbor Freight Predator 3500 problem (reported by some, but not all owners) where the generator may tend to run too rich, which can lead to engine stuttering, fouled plugs, poor fuel economy, clogged spark arrestors, and sometimes, raw gas leaking out of the generator.

This problem appears to involve, in one way or another, the charcoal canister that is supplied on many Predator 3500s to make the generator compliant with California emissions standards, but may also be present on generators sold outside of California (for example, I can confirm that generators sold in Florida Harbor Freight stores have charcoal canisters.)

Some users are finding that unregulated gasoline fumes, or in some cases, even raw gasoline) from the gas tank vent can flow into the canister, then onward into the air cleaner housing, and ultimately into the carburetor, causing an over-rich mixture, rough running, etc.

There are at least two scenarios where this may happen:
1) The generator’s fuel tank might have a defective tank vent nipple that allows raw gas to leak into the canister’s fuel tank vent line, flood the canister, and then leak into the air cleaner via the canister fume recirculation hose, causing the engine to run rich and potentially flooding the interior of the generator with raw gasoline. The exact nature of this supposed tank vent nipple defect may be as follows: the tank is fitted with a metal fuel cap vent pipe that runs inside the tank, bottom to top, that allows gas vapors to be pulled from the top of the tank, into the carbon canister, into the air cleaner, and into the carburetor. Since the vent pipe is soldered onto a fitting at the bottom of the tank, a bad solder joint can allow liquid fuel to flow into the vent line, flooding the canister with gas and in turn flooding the carburetor.
2) An improperly rigged Extended Run fuel tank can flood the canister with gas, if the owner fails to plug off the stock generator fuel tank’s vent hose, because as gas flows down from the extended run tank and fills the stock tank, the stock tank will ‘overflow’ into the stock generator fuel tank vent pipe, flooding the charcoal canister with raw gasoline and in turn, flooding into the air cleaner housing and leaking out of the generator.

Both of the above scenarios can be alleviated if you clamp off, or plug, the generator fuel tank cap vent hose that runs from the Predator’s tank to the charcoal canister. Once that’s done, if you wish, you can even remove the entire charcoal canister assembly.

To properly rig an extended run tank:
Since a Predator 3500 has no fuel pump (it’s gravity feed only), an extended run tank will need to be positioned directly above, or above and beside, the Predator’s own gas tank, so that gasoline can flow from the extended run tank, down to a special, leak-proof, aftermarket replacement gas cap on the Predator’s own tank. The replacement cap will have a fuel nipple installed in it, and will have a fuel-proof cap gasket so that the replacement cap can be tightly screwed onto the Predator’s tank, completely sealing the Predator’s own tank and allowing Extended Run tank gasoline to safely flow down into the Predator’s own tank without any leaks.

I used a 6.3-gallon, West Marine, ‘low permeability’ marine gas tank as my extended run tank. I ran a gas line from that tank, through a squeeze bulb, then through a quick-disconnect gasoline fitting, into the above-described replacement cap on my Predator tank. If desired, you could also rig a fuel filter in that line, if you are worried about fuel contamination getting into your generator’s carburetor.

Once this is accomplished, whenever you are using the Extended run tank, you MUST somehow clamp off, or plug, the Predator’s own fuel tank cap vent hose to prevent Extended Run gasoline from being diverted via the Predator’s vent hose into the canister and air cleaner housing, causing a potential disaster. In my case (see photo), I just added a fuel shutoff lever instead of removing the canister.


Finally, you must provide a ventilated gas cap on your Extended Run tank, so that your extended run fuel system doesn’t develop a vacuum that stops gas from siphoning and starves and stalls the generator As mentioned above, the West Marine tank I used, is the latest EPA-approved kind that has no vent. But West Marine also sells replacement caps that ARE vented, and fit perfectly on their ‘low permeability’ tank.

A third ‘rough-running’ scenario has also been reported, that does not involve the charcoal canister system. Several posters report that the generator housing is too air-tight, causing it to starve for air and therefore ‘run rich’ and ‘run hot’. The generally agreed-upon cure, is to open either the oil filler door, or the battery compartment door, when using the generator, to provide extra air into the carburetor intake. Several posters advise replacing the oil filler door with an aftermarket (or self-fashioned) door that has vent holes drilled into it.

FINAL NOTE: If you have purchased a Predator 3500 from Harbor Freight and also bought the extended warranty, you can return your generator for exchange if an unexpected defect occurs, but since modifying the Predator voids the warranty, keep all the charcoal canister parts, and DO NOT drill any holes in the Predator’s gas cap or the oil filler door…keep everything untouched, so that you can restore everything back to stock before returning the generator for warranty exchange.
Attached Images
File Type: jpg shutoff.jpg (130.1 KB, 23 views)
File Type: jpg rig.jpg (104.5 KB, 18 views)
File Type: jpg cap.jpg (71.6 KB, 16 views)
dangerousbob is offline  
Sponsored Links
Advertisement
 
post #4 of 13 (permalink) Old 04-24-2019, 09:47 PM
Senior Member
 
Join Date: Sep 2018
Location: Cape Elizabeth, Maine
Posts: 166
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 25 Post(s)
For over 20 years, I ran a Coleman PM1500 generator almost exclusively on a gravity feed 6 gallon Attwood marine fuel tank. Instead of messing with the original tank cap, I just inserted a quick-connect T in the middle of the fuel line (that you can see in the photo attached) from the onboard tank to the carb. I could instantly disconnect the 6 gallon tank and then just use the generator with the onboard tank as a portable unit.

I now use the same tank with my Onan RV-type genset, but no longer have to have the tank mounted above the genset, since it has a fuel pump.
Attached Images
File Type: jpg PM1500.jpg (87.1 KB, 12 views)
File Type: jpg Fuel T.jpg (90.4 KB, 15 views)
File Type: jpg Fuel Barb.jpg (47.7 KB, 11 views)
File Type: jpg Onan Installed.jpg (468.3 KB, 16 views)

Last edited by tabora; 04-24-2019 at 09:51 PM.
tabora is online now  
post #5 of 13 (permalink) Old 05-02-2019, 02:11 AM
Junior Member
 
Join Date: Jul 2018
Posts: 15
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Hello everyone . I wanted to try and attempt to post some pictures of my Predator and it's eleven gallon auxiliary extended run time fuel tank. It works flawlessly especially after I did the charcoal canister delete. Here's a list of the different parts I used to assemble it.

1. Predator 3500 generator extended run fuel cap. Bought on E-bay ITEM # 112797948530

2. 11 Gallon Aluminum fuel tank. Bought on E-bay. ITEM # 261842714625

3. 1/4" Ball valve (the outlet port on the fuel tank is 1/4" NPT ) E-bay ITEM # 143028320752

4. Yamaha 3/8 marine fuel line connector (Both male and female connector MUST be of the same style (Yamaha) to mate up together.) E-bay ITEM # 302066042297

5. Yamaha 1/4" NPT thread male fuel line connector. E-bay ITEM # 151485685337

6. 3/8" inline fuel filter bought at NAPA Auto parts.

7. 4 foot of 3/8" fuel line and trim to fit. Also bought at NAPA.

I made the fuel tank pedestal from 2X2 5/16 square tubing to mount the fuel tank to. I then wielded it to a Length of 2X6 1/4" tubing

( I used the heavier tubing because I was concerned about vibration and metal fatigue.) I then wielded the whole assembly to a length of 1/2" plate and U-clamped it to the 4 x4 square tubing bumper.

We have traveled approximately 9000 miles with the extended run fuel tank mounted as it is with no issues what so ever it works flawlessly with no revisions. The fuel siphons just as it should.
The Predator powers our 35 foot trailer with no problems at all.

I have no idea just how long the total fuel capacity will run the generator. I hope that I never HAVE to find out. but I have the peace of mind that we have the capability of 60 or 70 Hrs. of run time. Thanks for looking. SonicBob.


IMG_0107.JPG

IMG_0108.JPG

IMG_0110.JPG
Dslsmoke and tabora like this.

Last edited by sonicbob; 05-02-2019 at 11:41 AM.
sonicbob is offline  
post #6 of 13 (permalink) Old 05-02-2019, 09:08 AM
Junior Member
 
Join Date: Jul 2018
Posts: 15
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Hello Tabora. I must say that is one nice and clean setup you have there. Dose it have a remote start?
Is very loud? I wouldn't think so being RV service at one time. I may use some of your ideas when I do mine. Nice job. Sonicbob.
sonicbob is offline  
post #7 of 13 (permalink) Old 05-02-2019, 12:48 PM
Senior Member
 
Join Date: Sep 2018
Location: Cape Elizabeth, Maine
Posts: 166
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 25 Post(s)
Quote:
Originally Posted by sonicbob View Post
Hello Tabora. I must say that is one nice and clean setup you have there. Dose it have a remote start?
Is very loud? I wouldn't think so being RV service at one time. I may use some of your ideas when I do mine. Nice job. Sonicbob.
Yours looks very nifty, as well. If I were buying a new generator for that location (on an island 15 miles off-shore), I would probably emulate what you have done with the Predator. I purchased the Onan in August 2000, but didn't actually swap it into operation until last summer.

Yes, it has 2 remote start panels, one in each of the two buildings it serves (it's mounted on the back of my shed/bathroom, about 75' back from the cottage). It is quite quiet, about 72dB(A) @ 10ft at full load (uncovered), but it's not as quiet as your Predator. It would be much quieter mounted in an RV compartment. That's why it's mounted way out back. The little Coleman it replaced was in a plastic truck box with foam lining, many 1" vent holes at one end and a 10" intake fan at the other end; the tank sat atop the box above the fan, and was stored in the box between the fan and generator.
Attached Images
File Type: jpg Onan Switch with Meter.jpg (111.1 KB, 10 views)

Last edited by tabora; 05-03-2019 at 05:44 PM.
tabora is online now  
post #8 of 13 (permalink) Old 05-02-2019, 01:01 PM
Junior Member
 
Join Date: Jul 2018
Posts: 15
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Thank You. for the compliment. It looks like the remote start is also an information center. again very cleanly done.
sonicbob is offline  
post #9 of 13 (permalink) Old 05-02-2019, 05:37 PM
Senior Member
 
Join Date: Sep 2018
Location: Cape Elizabeth, Maine
Posts: 166
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 25 Post(s)
Yes, the panel in the cottage had some blank space, so I added the battery meter to it to keep track of the condition. It already had the hour meter. I also added an outlet to the right of the panel after the picture was taken and have one of the Onan Voltage monitors there, too. I just have a smaller panel with only the start/stop switch in the shed, and of course also on the generator itself.

I was just looking at the 11gal tank you purchased and saw a 7gal pancake tank for ~$50 that I purchased to replace the Attwood marine tank. That should fit in there nicely next to the generator and I'll move the battery & charger inside the shed.
Attached Images
File Type: jpg Onan V-Meter.jpg (77.0 KB, 11 views)
File Type: jpg Shed Switch.jpg (58.5 KB, 8 views)
File Type: jpg Tank2.jpg (91.3 KB, 10 views)

Last edited by tabora; 05-03-2019 at 05:51 PM.
tabora is online now  
post #10 of 13 (permalink) Old 05-04-2019, 01:52 AM
Junior Member
 
Join Date: Jul 2018
Posts: 15
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Yes I actually looked at that tank when I was considering fuel reservoirs. But mounting it presented some problems and I didn't have the room either. I did like the fact that it has a fuel gauge. I simply use a length of 3/8" wooden dowel with a zip tie pulled down snugly. I slide the zip tie to the top Stick the tank then slide the tie down to the wet area on the stick. And after using the generator just restick it for usage.

After every trip and we're back home I simply drain out a gallon or so to use in the riding mower. And doing that helps keep the gas fresh in it.
tabora likes this.
sonicbob is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Power Equipment Forum : Power Equipment Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in













Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome