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Old 09-24-2013, 10:52 AM   #1
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Fuel leaking on fill up

Fuel leaking on fill up. I think it dropped about 3-4 gallons (estimated) I thought I had a rusted tank (The skid plate is in sad shape) but then I realized I have a poly tank. So what are the likely culprits? Filler hoses, Fuel pump gasket? Breather hose? Any thoughts to make the troubleshooting go faster would be appreciated.

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Old 09-24-2013, 11:13 AM   #2
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Drop the tank and look at the filler hose and vent hose most likely culprits.

Where is it leaking from right at your feet as you fill it?


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Old 09-24-2013, 11:47 AM   #3

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Poly tank may be cracked also. Time to drop it all and fix it all.

If the tank is still good put on all new rubber hose which is fuel injection grade there is a difference.

If the skid is bad look around for a new one or repair it.
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Old 09-24-2013, 12:16 PM   #4
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I'm with you Joker, it's gonna get all dropped and all fixed.
SaharaGreen, I am not sure exactly, the rusted out skid plate prevents me from seeing the source, it drops to the skid plate and then leaks off of there onto the ground on both sides.

Is cracking a common problem in these poly tanks?
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Old 09-25-2013, 06:37 PM   #5
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In my experience it's not a common problem. They hold up better than steel tanks. I was able to replace my fuel filler and vent hoses on my 20 gal. poly tank without dropping it. You can get to them through the rear of the wheel well. However, you could also have a fuel line leak on top of the tank. The prior advice is correct. The best way to check is to drop it and check everything.
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Old 09-26-2013, 08:01 AM   #6
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If the leak is happening only when you fill up I'd look at the filler host that goes from the neck to the tank first. Remove the plastic panel in the wheels well and remove the plate on the rear that holds the filler neck in. Go to the station and get some gas, while pumping look and see where the gas is running out. Then go home and make needed repairs.
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Old 09-26-2013, 09:38 PM   #7
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Good ideas, but I think I'm gonna drop it and check everything. Can;t be too careful with explosives.
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Old 09-28-2013, 06:51 PM   #8
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Did you find your leak? My '88 did the same thing and it ended up being the two rubber grommets on top of the tank that go to the roll over valve. Its a very inexpensive fix. Got the grommets from the dealer for about 5-10 bucks.

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