1999 Chevrolet Suburban Fuel pressure

Tiny
TREADING
  • MEMBER
  • 1999 CHEVROLET SUBURBAN
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 120,000 MILES
I recently replaced my fuel pump, and filter. When I try and start it, it will start then it seems like the fuel pump would shut off and the engine shuts off after as soon as it starts. Any help would be appreciated
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Tuesday, January 20th, 2015 AT 8:22 PM

5 Replies

Tiny
TY ANDERSON
  • EXPERT
Why did the fuel pump get replaced to begin with?
If you spray starting fluid spray into the intake tube while someone is cranking the engine does the trunk start up and running if you meter the sprays into the intake tube?
This would give a clue if it fuel related.

Is there a security light on or flashing when cranking?
I've had vehicle security system causing this condition.
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Tuesday, January 20th, 2015 AT 8:53 PM
Tiny
TREADING
  • MEMBER
It was replaced because my truck stopped on the free way after several months of starting and not starting. Could not hear the winding noise that goes along with the fuel pump starting. And yes the engine will run with someone spraying into the engine, and I didn't look to see if a security light was on
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Tuesday, January 20th, 2015 AT 9:08 PM
Tiny
TY ANDERSON
  • EXPERT
Did you happen to look closely to the fuel pump electrical connector? To see if there are any melted terminals. Usually the GM fuel pump I've done come with an updated electrical connector you cut and splice in a new connector to fit the new fuel pump?

Check the fuel lines to and from the fuel tank to make sure none of the fuel lines are pinched reducing fuel flow to and from the engine. If you have the means check the fuel pressure when cycling the ignition key. I believe most major auto parts store have a loaner tool program that allows you to rent tools or in this case a fuel pressure gauge. (Pressure should be above 55psi)

Its fuel delivery issue and I'd hate to tell you to drop the fuel tank again, but maybe you could lower it enough to disconnect the electrical terminal to the fuel pump. Check for any melted parts on the vehicle side connector and see if your getting power and ground to the fuel pump electrical connector (with the key on engine not running).
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Tuesday, January 20th, 2015 AT 10:45 PM
Tiny
TREADING
  • MEMBER
I did make the new connection for the fuel pump, there was no melting of the old connectors. I guess I can check for pinched lines, but it does turn over for a second before it shuts off
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Tuesday, January 20th, 2015 AT 10:57 PM
Tiny
TY ANDERSON
  • EXPERT
Splicing in new connections is real common on these fuel pumps.

You'll need to test for fuel pressure. If it is building pressure or is lacking enough pressure ( or fuel flow due to pinched lines) knowing what the fuel pump is doing. You'll need more answers as to why the engine stalls right after start up.
If you can keep the engine running with starting spray, you can assume everything else is functioning normally except the fuel system.

Adequate fuel and air, spark, timing and compression are all required for the engine to run.
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Wednesday, January 21st, 2015 AT 7:37 PM

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