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No fuel at throttle body?

Tiny
MTWCBEAR
  • MEMBER
  • 1993 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 177,000 MILES
5.7L will not start. Have no fuel from the injectors. Fuel pump putting out 12-13psi. Checked injectors pulsing OK. Power to relay OK. New throttle position sensor, IAC, fuel pressure regulator. Have plenty of spark. Engine will start only with using starting fluid and will run OK for a while then shuts down and will not start again unless we use starting fluid. Can it be inside the throttle body itself. We have checked just about everything electrical and found no problems. Just can't keep fuel running thru injectors.
HELP? Don't have much hair left to pull out!
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Monday, February 15th, 2010 AT 12:56 PM

7 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
It sounds like the fuel pressure is fallen off. CAN you confirm the fuel pressure stays while running?
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Monday, February 15th, 2010 AT 1:40 PM
Tiny
MTWCBEAR
  • MEMBER
  • 4 POSTS
Just replaced throttle body. Still same problem. Engine will only start with starting fluid. It will stay running if you keep engine at around 1200rpm's. Anything less and it dies and will not re-start without the starting fluid.
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Monday, February 15th, 2010 AT 3:05 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Verify the fuel pressure if its within specs and clean out the idle air control valve and test the TPS and MAP sensors
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+1
Monday, February 15th, 2010 AT 3:15 PM
Tiny
MTWCBEAR
  • MEMBER
  • 4 POSTS
New IAC and TPS. Fuel pressure within specs. Replaced MAP also. Still no fuel.
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Monday, February 15th, 2010 AT 4:09 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Checked injectors pulsing OK-with the correct fuel pressure it should be getting fuel-

Do you hear the fuel pump come on when key at run?
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Monday, February 15th, 2010 AT 4:15 PM
Tiny
MTWCBEAR
  • MEMBER
  • 4 POSTS
OK. Pulled IAC, again, to check it even though it is new. Replaced IAC, removed EGR and plugged holes with duct tape and if fired and RAN! Replaced EGR and now the engine started up just fine :) thanks for helping me.
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Monday, February 15th, 2010 AT 5:06 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
You are welcome, please use 2CarPros anytime we are here to help.
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Monday, February 15th, 2010 AT 6:25 PM

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