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Gas Pickup Problem Tank

sullivanjay

By sullivanjay
in Ask A GM Technician

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sullivanjay Enthusiast

sullivanjay

Posted
Posted

1995 Chevrolet K1500 / 5.7

I have not been able to pick up the last 4 to 5 gallons from my gas tank. This has been verified by running out of gas three times while above the empty indicator on the gas gauge. Once I coasted to the gas pumps and could only get 20 gallons in the 25-gallon tank. Recently it also started to “leak” gas only when it was running or presurized. I took the tank out today and although I have to replace the fuel pump assembly because of the gas leak from rust I really don’t see any reason why it was not picking up the last few gallons. Anyone experience something like this? Should I be looking somewhere else? I would hate to put this back together (on the ground) and not fix it. What’s with the plastic boxes in the tank? Should I be checking inside the tank for a problem? Will be ordering up the parts tomorrow but I feel uncomfortable not finding something conclusive. Any help would be appreciated. / J

cammiller Enthusiast

cammiller

Posted
Posted

Was the filter/sock installed and tight to the pump? I would look inside the tank for debris and damage while you have it out. If you are replacing the entire fuel sender assembly and pump, and you see no damage to the tank, I can't see any issues putting it back together.

hubbycap Senior Enthusiast

hubbycap

Posted
Posted

Never could get more than 22 gals in my '95, even when flat empty, coasting in. BTW you don't have to replace the sending unit on a '95, you can buy the Delco pump only replacement, about $50.

sullivanjay Enthusiast

sullivanjay

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Never could get more than 22 gals in my '95, even when flat empty, coasting in. BTW you don't have to replace the sending unit on a '95, you can buy the Delco pump only replacement, about $50.

 

Thanks for info hubbycap. I could run this tank down to the solid red bar on the gas gauge. Now I run out before I get to the first red bar or just after I pass the quarter tank mark. I did see that most of the components on the pickup assembly where replaceable. I need to replace the hole unit because of the rusted lines external to the unit. / J

sullivanjay Enthusiast

sullivanjay

Posted
  • Author
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Was the filter/sock installed and tight to the pump? I would look inside the tank for debris and damage while you have it out. If you are replacing the entire fuel sender assembly and pump, and you see no damage to the tank, I can't see any issues putting it back together.

Thanks Bluegorilla, Sock appears to be tight. I will measure to see if it's on the bottom. I was thinking that because it was sucking air from a leak that when the volume of air increased in the tank from a low fuel level that perhaps the fuel pump could not overcome the air leak. With a closed fuel system will it create a slight vacuum in the tank. At least some negative pressure. After all just listen to the air rush when you remove the gas cap. Wish I could have thought of that before so I carefully could have listened for a reduced noise of rushing air when I took the gas cap off.

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