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Old 12-23-2006, 08:45 PM   #1
jimmyprobw/gas
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fuel problems

fuel pumps real slow into my vechile fuel indicator light reads empty takes real slow to pump gas is it the sending unit
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Old 12-24-2006, 06:06 AM   #2
Chris Stewart
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Re: fuel problems

Is it slow putting fuel into the fuel tank at the gas station OR is the fuel pump inside the fuel tank slow building pressure?
What year Blazer are you refering to?
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Old 12-24-2006, 09:36 AM   #3
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Re: fuel problems

I would really like to help you, but I don't have a clue what you are saying.
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Old 12-24-2006, 10:00 AM   #4
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Re: fuel problems

Quote:
Originally Posted by jimmyprobw/gas
fuel pumps real slow into my vechile fuel indicator light reads empty takes real slow to pump gas is it the sending unit
Info needed on this one?????


Tips on getting a good answer to your questions.
People trying to answer your question do not have a crystal ball.
So give them all of the info you have like year make and model and engine and transmission and mileage.
Also cars engine and transmission service history or any recent repairs or problems.
Also a description of your problem and what it is doing or not doing.
If you have codes give up the code no.
And remember a code does not say replace the part but only points to the problem that you have to check out.
So to better help you give up all of the info you have on it.
MT
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Old 12-26-2006, 10:54 AM   #5
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Re: Fuel Problems

[quote=Chris Stewart]Is it slow putting fuel into the fuel tank at the gas station OR is the fuel pump inside the fuel tank slow building pressure?


2005 gmc jimmy. very slow putting gas into at the gas station. gas just spills out. I dont know if it is the fuel tank slow building pressure. when i take the gas cap off a big puff of air comes out.

Quote:
Originally Posted by BlazerLT
I would really like to help you, but I don't have a clue what you are saying.
2005 gmc jimmy gas just spills out acting like it is full. No recent problems b4. Some people seem to think that someone may have been trying to siphon gas out of my truck. other people think it may be the sending unit. I think that controls your gas guage.

Last edited by Blue Bowtie; 12-26-2006 at 12:24 PM. Reason: Edited for clarity
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Old 12-26-2006, 11:08 AM   #6
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Re: fuel problems

[quote=jimmyprobw/gas]
Quote:
Originally Posted by Chris Stewart
Is it slow putting fuel into the fuel tank at the gas station OR is the fuel pump inside the fuel tank slow building pressure?


2005 gmc jimmy very slow putting gas into at the gas station, gas just spills out . I dont know if it is the fuel tank slow building pressure. when i take the gas cap off a big puff of air comes out
. What would be the causes off the fuel tank slow building pressure?
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Old 12-26-2006, 11:12 AM   #7
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Re: fuel problems

You have a tank vent stuck closed.

You will have to drop the tank and get it moving again. It allows air to escape when filling your tank up. With it stuck closed, the only way for the air to escape is up the fill neck which causes what you are seeing.
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Old 12-26-2006, 12:09 PM   #8
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Re: fuel problems

The other possibility is that the flame arrestor/anti-siphon/anti-surge device is damaged:



You MAY be able to get that out without removing the fuel tank, but it would be quite a lot of work to twist it out of the space. It would be safer to remove the tank, and since there is a suspected problem with the fuel level sensor, it would be a good idea to remove the tank and tank top unit for inspection anyway.

That doesn't explain the pressure in the tank, however. Unless the vehicle is moved from a cooler space to a warmer space and is not running, there should be very little pressure in the tank. To my knowledge, the factory design scheme for controlling evaporative fuel emissions is still to maintain a slight vacuum in the tank while the engine is running. If the tank has apparent pressure when the cap is removed within one minute of the engine shutting off, there may be a problem with the evaporative emissions control system. Since the truck is less than two years old, and the fuel tank pressure control system (and entire fuel tank) are significant parts of the evaporative emissions control system, and the truck is likely still within the federally mandated emissions warranty period, I'd suggest returning it to the dealer and reporting the problem. If you are outside the United States, that warranty period may not apply, but it is worth investigating.
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