cancel
Showing results for 
Search instead for 
Did you mean: 

External Fuel Tank for Generator

TechWriter
Explorer
Explorer
Several months ago I found out that the fuel line to my Generac Q-55G was clogged. I've looked into replacing the fuel line, but it would involve dropped the RV's gas tank. My local service guy (who has done this on other RVs) looked into dropping the gas tank on my 2001 SeaView, but gave up. Apparently, it's an "over-engineered" RV. Too complicated and labor intense.

Anyway, I nearly gave up fixing the generator until we crossed the Southwest this summer. Just let me say that my RV's dash air wasn't up to that cooling task. Never again.

So I think I'm going to install a 5 gal external gas tank for my generator. Anyone else done this?
2004 - 2010 Part Timer (35’ 2004 National RV Sea Breeze 8341 - Workhorse)
2010 - 2021 Full Timer (41’ 2001 Newmar Mountain Aire 4095 DP - Cummins)
2021 - ??? Part Timer (31’ 2001 National RV Sea View 8311 - Ford)
www.rvSeniorMoments.com
DISH TV for RVs
9 REPLIES 9

TechWriter
Explorer
Explorer
okhmbldr1 wrote:
If you can't do this test yourself, find a mechanic who will locate the line from the gas tank to the generator. Disconnect line at the generator, then have him cut the line close to the gas tank. Use about 40 lbs. of air and blow through the line towards the generator, if stuff comes out then the line is clear. If it wasn't clogged in that section of line, then blow the line into the tank. Then use a union and hose clamps to join the two lines together. They should be clear, so hook up the line to the generator and give it a try.

Tried this, but no dice. External fuel tank on order.
2004 - 2010 Part Timer (35’ 2004 National RV Sea Breeze 8341 - Workhorse)
2010 - 2021 Full Timer (41’ 2001 Newmar Mountain Aire 4095 DP - Cummins)
2021 - ??? Part Timer (31’ 2001 National RV Sea View 8311 - Ford)
www.rvSeniorMoments.com
DISH TV for RVs

Grit_dog
Explorer III
Explorer III
It would take like 10 minutes to plumb it to an outboard motor boat gas tank provided there’s an adjacent compartment to put the tank in and able to drill an access through or out to the generator enclosure.

Sounds like OP doesn’t know anymore than one mechanic is telling him though and unable to discern what the problem (s) or legit permanent solution requires though. So I’d suggest a second opinion.
2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold

Bobbo
Explorer II
Explorer II
jjrbus wrote:
I have an external extended run fuel tank for my Honda 2200. I see no reason you can't do one with an Onan.

The ONAN doesn't have a fuel cap to remove. It has a hose running into the RV's main fuel tank. He would have to:

1. cut the fuel supply line
2. put a shutoff valve in the side going to the fuel tank
3. put a "Y" connector between the shut-off and the ONAN
4. Put a shutoff valve in the hose going to the external tank
5. Run that hose to the external tank.

You would have to close the shutoff valve to the line not being used, or the generator would just suck air.
Bobbo and Lin
2017 F-150 XLT 4x4 SuperCab w/Max Tow Package 3.5l EcoBoost V6
2017 Airstream Flying Cloud 23FB

jjrbus
Explorer
Explorer
I have an external extended run fuel tank for my Honda 2200. I see no reason you can't do one with an Onan.

okhmbldr1
Explorer
Explorer
If you can't do this test yourself, find a mechanic who will locate the line from the gas tank to the generator. Disconnect line at the generator, then have him cut the line close to the gas tank. Use about 40 lbs. of air and blow through the line towards the generator, if stuff comes out then the line is clear. If it wasn't clogged in that section of line, then blow the line into the tank. Then use a union and hose clamps to join the two lines together. They should be clear, so hook up the line to the generator and give it a try.

Dusty_R
Explorer
Explorer
Some MH's have two fuel lines into the gas tank, one goes to the bottom of tank, the other goes down only 3/4's of the way down for the onboard generator, so the generator cannot use-up all the gas in the tank.

enblethen
Traveler
Traveler
Some manufacturers install copper/steel rigid tubing out of fuel and then transitions to rubber tubing then back to rigid.
Find someone willing to crawl under rig to follow line.
Which rig are you dealing with? Diesel coach with gas genset?

Bud
USAF Retired
Pace Arrow


2003 Chev Ice Road Tracker

JoeH
Explorer II
Explorer II
Find a different service guy... sounds like he just didn't want to do the work or maybe look into taping into the chassis motor fuel line. Just make sure if you do that, when running the genset, you don't completely drain the fuel tank , leaving you stranded.
I've also read where some folks have accessed the fuel tank by cutting a hole in the floor of the coach... could be an option , depending on your floor plan.
Joe
2013 Dutch Star 4338- all electric
Toad is 2015 F-150 with bikes,kayaks and Harley aboard

Grit_dog
Explorer III
Explorer III
I have no idea how your rv is configured but it’s not unreasonable to think you could plumb in an outboard motor tank or any suitable tank really.
2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold