I cannot put gas in the tank

Tiny
DTOMMASONE
  • MEMBER
  • 2000 PONTIAC GRAND PRIX
  • 3.8L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 205,000 MILES
Cannot put fuel in car. I have replaced the tank pressure sensor and filler neck. I still have the same problem.
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Friday, November 25th, 2016 AT 4:15 PM

9 Replies

Tiny
WRENCHTECH
  • EXPERT
If the canister vent valve is stuck closed it will do that.

It is located behind the left rear wheel well.

https://www.2carpros.com/images/external/86452774.gif
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Saturday, November 26th, 2016 AT 9:04 AM
Tiny
DTOMMASONE
  • MEMBER
I have even cut the two lines that go to the canister and I still have the same problem. I basically bypassed the canister and canister vent valve. I am thinking it is the valve at the top of the tank that is to the right of the pump it has two lines to it and no electrical plug. I think it is another vent valve.
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Saturday, November 26th, 2016 AT 11:12 AM
Tiny
WRENCHTECH
  • EXPERT
The tank is a sealed system. It has no other vents. It can only be something restricting the filler pipe at this point. It likely has a rollover ball in the filler.
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Saturday, November 26th, 2016 AT 11:14 AM
Tiny
DTOMMASONE
  • MEMBER
I replaced the filler neck and there was nothing in the neck. Could the ball be in the tank right at the opening were the filler neck attaches? What is the thing on the top of the tank that I was telling you about?
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Saturday, November 26th, 2016 AT 11:22 AM
Tiny
WRENCHTECH
  • EXPERT
I do not think that was a valve. It is just hose connectors.
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Saturday, November 26th, 2016 AT 11:27 AM
Tiny
DTOMMASONE
  • MEMBER
What about the check ball? Is it in the tank were the filler neck attaches? Because I put a new filler neck on and there was no check ball in the assembly.
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Saturday, November 26th, 2016 AT 11:51 AM
Tiny
WRENCHTECH
  • EXPERT
I do not know. Stick something down there and find out.
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Saturday, November 26th, 2016 AT 11:53 AM
Tiny
DTOMMASONE
  • MEMBER
Thank you for your insight and help.
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Saturday, November 26th, 2016 AT 12:07 PM
Tiny
CJ MEDEVAC
  • EXPERT
Have you taken it loose at the tank?

Do nit know your rig's specifics

I took pictures of my brother-in-law installing a new fuel pump.

1) This is a Tahoe

2) These are the Fuel filler hose and the fill vent hose (lets air out of the tank while fuel takes it is space)

3) Hoses removed, See the blue fitting? It has a screen on it.

You cannot see it but the fill hose fitting (The big hole). Also, has a grid or screen in it too. The squares in it were larger than the blue fitting. My hypothesis is this is an anti-somebody sucking your fuel out prevention measure.

Imagine somebody eating a Little Debbie oatmeal cream pie (or two) then stuffing the wrapper(s) in your fuel neck.

First fill up afterwards might shove the wrapper on down and it now mostly covers the grid.

Just a thought, this may not be your answer either. But it would be an easy check!

The Medic
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Saturday, November 26th, 2016 AT 4:30 PM

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