1999 Pontiac Grand Am Fuel pump and fuel sending unit? Diff

Tiny
COACH ROBINSON
  • MEMBER
  • 1999 PONTIAC GRAND AM
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 150,000 MILES
I have a 99 grand am that failed to run. It would turn over once and run for like.875 sec. (Estimate) Then shut back off after this it would only turn. It will do this every couple of hours if you leave it and come back to it.

I thought it was the fuel pump as the fuel gauge had been giving false readings for months. I found a used fuel pump at a salvage yard and replaced it but had to use the old float (sending unit?) As it did not have one.

Could the sending unit (Float assembly?) Keep the car from running or causing these syptoms.
Thursday, November 26th, 2009 AT 6:45 PM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Power your coil from the battery and tell me if it continues to run-let me know
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Thursday, November 26th, 2009 AT 7:51 PM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
No. The sending unit simply sends a signal to fuel gauge.

Do as Raz suggested.
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Friday, November 27th, 2009 AT 6:14 AM
Tiny
COACH ROBINSON
  • MEMBER
  • 2 POSTS
I will try running the coil from the battery tomorrow. Also, while I'm trouble shootinng, I had a friend suggest that the fuel lines could be air locked where I changed the pump. Could this be the case? He recomended I blead the air out through the schrader valve. Where is the schrader valve located? Bottom side of the fuel rail. I looked every where and did not see it thats the only other place it could be.

Thanks,
Kevin
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Friday, November 27th, 2009 AT 6:37 PM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Shraeder valve is on fuel rail, usually has a black plastic cap covering it.
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Saturday, November 28th, 2009 AT 7:50 AM

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