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Car starts but wont stay running

Tiny
T.FRIDAY
  • MEMBER
  • 1999 PONTIAC BONNEVILLE
  • 155,000 MILES
When I was able to get it to stay running by forcing gas to the car there was black smoke coming from tailpipe. Fuel pressure was 50lbs. Psi. Changed fuel filter, and relay switch, took off fuel pressure regulator and it was full of gas. So is it the fuel pump or the regulator?
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Sunday, March 18th, 2012 AT 4:35 PM

7 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
So the fuel pressure is 50psi right now?Also if you pull the fuel pressure regulator vacuum line off while it was mounted was there fuel in the vacuum nipple area?
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Monday, November 5th, 2018 AT 7:07 PM
Tiny
T.FRIDAY
  • MEMBER
  • 9 POSTS
No it just smelled like gas
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Monday, November 5th, 2018 AT 7:07 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
So you still have 50psi of compression?So when the engine was running you had black smoke coming out the tail pipe and it was running rough?Any codes in the computer?Hows your coolant temp sensor?What is your compression readings?Do you have a nic blue spark to all the cylinders?
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Monday, November 5th, 2018 AT 7:07 PM
Tiny
T.FRIDAY
  • MEMBER
  • 9 POSTS
Cant keep the car running long enough to check anything. No check engine light. When it did run by pressing the gas pedal and forcing gas to it, it sounded awful, and yes black smoke, but as soon as you let off the gas it cut off.
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Monday, November 5th, 2018 AT 7:07 PM
Tiny
T.FRIDAY
  • MEMBER
  • 9 POSTS
Only light I see is check gages
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Monday, November 5th, 2018 AT 7:07 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Check the fuel pressure again see if the fuel pressure is bleeding down when the fuel pump isnt running?Also pull the spark plugs and see if the spark plugs have excessive fuel build up on them.
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Monday, November 5th, 2018 AT 7:07 PM
Tiny
AMY DEWITTE
  • MEMBER
  • 11 POSTS
There is a recall on the Pontiac's Fuel pressure Regulator's. This sounds like your problem. Call pontiac with your vin# and get it fixed for free.
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Monday, November 5th, 2018 AT 7:07 PM

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