Question about 2006 Isuzu i-350

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Refueling problem with my Isuzu

My problem is not that the gauge is indicating incorrectly, it is indicating correctly but I am unable to fill the tank to the top. This is borne out by the mileage I get, from what I see going into the tank and from what the fuel gauge is indicating after I have filled up, so all my observations are pointing to the fact that the tank is not filling the way it should. Is there perhaps a breather system in the tank that can get blocked and therefore prevent fumes from escaping? I cannot find a detailed decription of the fuel tank system anywhere.

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So true
if this tank does not fill, at all gas stations its not the stations
easy no.
so is the car, is it?
the EVAP solenoid near the tank must work.
when you KEY off to fill tank (DO YOU)? the valve opens
letting air into the neck filler of all modern cars, for sure in USA.
its an EPA law here. for lower fumes, (gas fumes in usa is the #1 smog here so.... bingo)
why not just find the valve, and replace it or just clean it
most just get gummy and stick.
each model car , this can be different placements or if different engine that you never stated.
in uSA

Posted on Oct 25, 2016

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Does the pump at the gas station just stop when you try and fill it up? There is a charcoal canister up towards the front engine compartment that the vent line runs to from the gas tank. You can check it and make sure it is not clogged but nothing can really cause a gas tank from not filling it up all of the way. I think you have a defective sending unit. You would have to take it to a certified mechanic to take a look at the gas tank if you feel it isnt filling up all of the way. They may have a special tool to check it. Hope this helps. Good luck. - Tech101

Posted on Jun 26, 2008


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The fuel sending unit could be bad or siezing up once the float gets near the top. The way they work is the higher the float the or lower the float the resistance changes and the information is sent back to the fuel guage. It could either be the sending unit which is located in the tank or it could be a bad fuel guage. The chances of the issue being the fuel guage is a lot more rare though. Good luck and keep me posted. If you found this solution helpful please rate it when you get a chance.

Thanks - Tech101

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