1994 Pontiac Bonneville Stalling around bends & gas mil

Tiny
ARTHUR1031
  • MEMBER
  • 1994 PONTIAC BONNEVILLE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 13,800 MILES
Hello - while driving around large bends such as an exit ramp, the car will stall out when the gas gauge reads around 1/4 tank full. I know it is because the gas is moving in the tank and not getting picked up by the pump properly but is this normal? My 89 Bonneville never did this no matter how low. Once I get around the bend, I put the car in park (not sure why I can't start in neutral) and it starts up. I also notice the car's fuel gauge appears to be off by almost 1/8 tank (is really empty when it shows 1/8) and the fuel efficiency is poor. The car had a new fuel pump replaced (was my parent's car) and I assume it was an OEM part as the dealer replaced but this problem did not exist before. The dealer told my mom the problem of stalling was due to baffles in the tank causing the fuel to not reach the pump but that seems a lame answer or else this situation would require a recall for safety (stalling on an exit ramp is a good way to get rear ended by a semi). As for the fuel economy, I didn't know if a bad fuel pump could cause poor gas mileage (I know there are a ton of things that could cause this and I am working on all the other things to help that). Thank you much for your assistance.
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Thursday, March 6th, 2008 AT 8:29 AM

5 Replies

Tiny
JACK42
  • MEMBER
They are absolutely correct about the baffles in the tank. If that was an issue when they replaced the pump they should have fixed it. This would also explain why the gauge reads off, the baffle may be interferring with the float. If it runs out of fuel on a turn, the tank is where you should start looking for problems
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Thursday, March 6th, 2008 AT 12:22 PM
Tiny
ARTHUR1031
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Thank you for the info though I am confused on what I should be looking for in the tank. Are the baffles part of the tank or separate and what defect am I looking for? I assumed baffles were like small indents in the tank but now I realize it is something design to regulate flow of fluid. So can the baffles be replaced? And would this in any way have an impact on fuel efficiency? Thanks again.
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Friday, March 7th, 2008 AT 1:36 AM
Tiny
JACK42
  • MEMBER
Cant be replaced. They are usually held down in the tank by push-nuts or tinsman nuts. When tank is out, you will be able to look inside and see the baffle. It is also designed to control fuel slosh to calm the gauge down
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Friday, March 7th, 2008 AT 7:16 AM
Tiny
ARTHUR1031
  • MEMBER
Hello Jack - once again thank you for the info but I confess I must be a moron as I still do not understand what is to be fixed. Your first response indicated the (mechanic) should have fixed the problem when replacing the fuel pump. If the baffles cannot be replaced, would that indicate I would need an entirely new fuel tank or is there some way to repair the baffles? Thanks again, much appreciated.
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Friday, March 7th, 2008 AT 7:44 AM
Tiny
JACK42
  • MEMBER
My bad. Sometimes they come loose in the tank and need new nuts to hold them down, if the studs in the tank are bad, then you may need a new one
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Friday, March 7th, 2008 AT 11:28 AM

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