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09-13-2015, 07:57 PM
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#1
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Senior Member
Join Date: Sep 2015
Posts: 165
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Generator issue
I have a class A with an onan 7000 generator. It appears that I am getting no gas to the generator. I replaced the fuel filter and pump with no results. I can introduce gas into the generator carb and it will start. Anyone have any ideas. Gas tank is full.
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09-13-2015, 08:03 PM
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#2
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Senior Member
Tiffin Owners Club
Join Date: Mar 2015
Location: Southern NM
Posts: 2,514
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I would look at the fuel line going to your gen set, I am not familiar with your set up, but sounds like your fuel line is clogged or collapsed, using an air compressor at a low setting like 10-15 psi tri to send air back through the line into the tank, and see if you can hear bubbles, I would take the gas cap off so you are no pressurizing the tank.
or if you have a vacuum pump (hand operated) you could attach it to the line and try to pull some fuel through the line.
__________________
2005 Tiffin Allegro Bay 37DB
W22 Workhorse Chassis 8.1 Flat Towing a 82 Jeep CJ7
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09-13-2015, 08:04 PM
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#3
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Senior Member
Rexhall Owners Group
Join Date: Jun 2015
Location: East of Tacoma, WA
Posts: 368
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Does the pump sound like its pumping?
__________________
1996 Rexhall xl3400
Ford 460
Tag axle
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09-13-2015, 08:12 PM
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#4
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Senior Member
Join Date: Jul 2014
Posts: 35,413
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When my generator didn't start I pulled the line off the fuel pump, on the carb side and blew back thru it with my mouth. I must have cleared something out of the fuel pump check valves.
The pump was ticking away but pumping drops of gas. After the , wait for it, blow job, it pumped like new.
I have put 50 to 60 hours on it since.
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09-13-2015, 08:58 PM
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#5
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Senior Member
Join Date: Sep 2015
Posts: 165
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The pump is making noise like it is trying to pump. When I pulled the fuel pump I had the line squeezed so I didn't drain my tank but I fully expected to get gas on my hands but encountered none.
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09-13-2015, 09:02 PM
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#6
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Senior Member
Tiffin Owners Club
Join Date: Mar 2015
Location: Southern NM
Posts: 2,514
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Quote:
Originally Posted by twinboat
When my generator didn't start I pulled the line off the fuel pump, on the carb side and blew back thru it with my mouth. I must have cleared something out of the fuel pump check valves.
The pump was ticking away but pumping drops of gas. After the , wait for it, blow job, it pumped like new.
I have put 50 to 60 hours on it since.
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Quote:
Originally Posted by Kasey
The pump is making noise like it is trying to pump. When I pulled the fuel pump I had the line squeezed so I didn't drain my tank but I fully expected to get gas on my hands but encountered none.
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Quote:
Originally Posted by CJ7365
I would look at the fuel line going to your gen set, I am not familiar with your set up, but sounds like your fuel line is clogged or collapsed, using an air compressor at a low setting like 10-15 psi tri to send air back through the line into the tank, and see if you can hear bubbles, I would take the gas cap off so you are no pressurizing the tank.
or if you have a vacuum pump (hand operated) you could attach it to the line and try to pull some fuel through the line.
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Ill just repost this, maybe it got overlooked
__________________
2005 Tiffin Allegro Bay 37DB
W22 Workhorse Chassis 8.1 Flat Towing a 82 Jeep CJ7
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09-13-2015, 09:06 PM
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#7
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Senior Member
Join Date: Sep 2015
Posts: 165
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Do I need to be concerned about creating static electricity when blowing air into the tank?
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09-13-2015, 09:12 PM
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#8
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Senior Member
Tiffin Owners Club
Join Date: Mar 2015
Location: Southern NM
Posts: 2,514
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Quote:
Originally Posted by Kasey
Do I need to be concerned about creating static electricity when blowing air into the tank?
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I have never heard of that before.
__________________
2005 Tiffin Allegro Bay 37DB
W22 Workhorse Chassis 8.1 Flat Towing a 82 Jeep CJ7
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09-14-2015, 05:03 AM
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#9
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Senior Member
Tiffin Owners Club
Join Date: Sep 2012
Location: Maryland
Posts: 1,437
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Get a can of gas and put the fuel line in it and see if it will start and run. If it does then you know the problem is in the fuel line going to the tank. Make sure you use new fuel line from the pump to the gas can.
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09-14-2015, 08:47 AM
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#10
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Senior Member
Workhorse Chassis Owner
Join Date: Jun 2006
Location: Northwestern Montana
Posts: 3,513
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A crack in the flexable fuel connector line at top of fuel tank will prevent the fuel pumps ability to supply fuel to the generator. You can check for this problem by applying vacuum to the line with either a vacuum hand pump, or simply applying suction by mouth.
__________________
Dieselclacker
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09-14-2015, 09:20 AM
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#11
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,671
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Almost surely a leak in the fuel line from tank to pump. The pump sicks air instead of fuel.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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