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Old 07-29-2016, 02:31 PM   #1
Mini-Skoolie
 
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Question Generator gas flow problem

My old gas generator's gas tank (attached to the bus) had gunk in it when I bought it, so I replaced the tank with one from a junk yard that was surprisingly very clean. However, there seems to be a fuel flow problem.

It goes like this: I can see the fuel filter bulb (between the tank and the engine) is full of fuel, and I start up the generator. About an hour later, it dies. I look at the fuel filter, and the bulb is empty. If I let it sit long enough, eventually the fuel filter fills up again and I can start it, and run it (for another hour only).

I done a lot of troubleshooting, and even took it to a small engine repair guy to no avail. Below is the detail on troubleshooting.

Is it gunk in the tank?: I took the petcock off and let the gas flow right out of the tank for a minute. There was no gunk, dirt, etc.

Is it the petcock?: I replaced the petcock with some brass fittings.

Is it the fuel line or filter?: I replaced both.

Is the line run in such a way that gravity can pull the gas down to the gen?: Yes, and I have made double sure it runs down, without ever going up/level.

The only other possibility might be the gas cap, the mechanic was telling me. Something about the vent in the cap, or something. Going to see if I can get another cap, but that's not easy to find. Does anyone have any other ideas?
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Old 07-29-2016, 02:52 PM   #2
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Year: 1993
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rebuild the carb too. old gas and debris will clog a carb fast. the float may be stuck. an internal filter may be clogged, lots could strain the gas flow to keep it from running.
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Old 07-29-2016, 02:55 PM   #3
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Before you buy a gas cap, see if it will stay running with it off.
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Old 07-29-2016, 03:17 PM   #4
Mini-Skoolie
 
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The flow problem appears to only be *before* it gets to the carb. The fuel filter is between the gas tank and the carb. The issue is between the gas tank and the filter, so that the filter won't fill with gas.
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Old 07-29-2016, 06:15 PM   #5
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Join Date: Nov 2010
Location: Andrews,Indiana
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Year: 1991
Coachwork: Bluebird
Chassis: AARE
Engine: 3116 Cat 250hp
Rated Cap: Her, me and Molly
What kind of generator is it? Does it have a fuel pump? If it doesn't have a fuel pump, unhook line at carburetor. Does fuel run out? Many times see through fuel filters don't look full but, are fine. You have to troubleshoot logically, don't just throw parts at it.
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Old 07-29-2016, 07:02 PM   #6
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Is the cap venting properly?
Sounds almost like it's creating a vacuum in tank... Running about an hour, then stopping... Then refilling the bulb slowly.


Oops, somewhere unusual beat me to it...


Stupid damned phone! I hate auto correct at times!


Edit:
Well crap!!! I'll start reading the thread better...
iPhone for forums suck sometimes
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