89 grand prix 2.8l.when i turn the key it wont turn over and i noticed gas on the ground. come to find out its coming out of the throttle body. seems like all the injectors are pumping fuel at once.


Asked by Jan 21, 2014 at 08:24 PM about the 1989 Pontiac Grand Prix LE

Question type: Maintenance & Repair

5 Answers


a vacuum controlled fuel pressure regulator has a vacuum hose and a diaphragm is inside to regulate. if diaphragm splits it sends fuel down the hose to intake. excessive fuel will block piston, you cannot compress a liquid

1 of 1 people found this helpful.

Once you get the gas out of the cylinders you'll need to replace the spark plugs. They're gas fouled now. HTH. -Jim

1 of 1 people found this helpful.

so the regulator is probably bad?

1 of 1 people found this helpful.

the amount of gas that came out was unbelievable. i opened the throttle body and it poored out

1 of 1 people found this helpful.

Either the regulator is bad or you've got a fuel injector(s) that's stuck open and allowing gas to just pour out when the fuel pump comes on. Also pull the vacuum line for the EVAP system at the intake. If the purge valve is stuck open that'll pull gas up into the intake as well. HTH. -Jim

Your Answer

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 2,469 nationwide Grand Prix listings starting at $1,900.


Pontiac Grand Prix Experts

  • #1
  • #2
    Tom Demyan
  • #3
View All

Related Models For Sale

Used Pontiac Bonneville
4 Great Deals out of 407 listings starting at $1,995
Used Chevrolet Monte Carlo
7 Great Deals out of 1,180 listings starting at $1,125
Used Pontiac Grand Am
957 listings
Used Chevrolet Camaro
385 Great Deals out of 31,349 listings starting at $3,495
Used Ford Mustang
337 Great Deals out of 42,078 listings starting at $1,488
Used Pontiac Firebird
8 Great Deals out of 693 listings starting at $2,850
Used Nissan Maxima
335 Great Deals out of 20,586 listings starting at $1,175

Used Cars For Sale

2008 Pontiac Grand Prix For Sale
9 Great Deals out of 383 listings starting at $1,900
2007 Pontiac Grand Prix For Sale
333 listings starting at $4,499
2006 Pontiac Grand Prix For Sale
3 Great Deals out of 440 listings starting at $4,000
2005 Pontiac Grand Prix For Sale
325 listings starting at $3,000

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.