1998 Chevy Suburban NO FUEL PRESSURE to start engine

Tiny
RONKASPER
  • MEMBER
  • 1998 CHEVROLET SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 115,000 MILES
Engine will not start due to lack of fuel pressure.

Fuel pump works when the relay contacts are closed manually for trouble shooting. Fuel Pressure then rises to normal.

It looks like the power from the ECM is not turning on the relay. The voltage from the ECM is not present. The relay works and all fuses are fine.

Could it be the ECM.

Has anyone had to replace the main ECM before in order to solve the fuel pump relay controle problem?

Cheers:
Ron
Do you
have the same problem?
Yes
No
Thursday, January 10th, 2008 AT 7:30 AM

3 Replies

Tiny
PEAR69
  • MEMBER
Your oil pressure sending unit is tied into your fuel pump relay feed wire. Try changing the oil pressure sending unit--however, if the sending unit is good and there realy is a low or no oil pressure condition, then your problem may be your oil pump--a blocked oil port inside the motor--a bocked oil pressure sending unit port--or something of that sort. Let me know how you make out.
Was this
answer
helpful?
Yes
No
Monday, January 14th, 2008 AT 8:43 PM
Tiny
RONKASPER
  • MEMBER
The pump finally did give out and I am having it changed. Your comments were a big help.

Cheers:
Ron
Was this
answer
helpful?
Yes
No
Tuesday, January 15th, 2008 AT 6:58 PM
Tiny
PEAR69
  • MEMBER
Ron, being that you are changing the fuel pump, have the chassy harness fuel pump electrical connector changed. It is the plug that plugs into the fuel pump. I have had so many problems with these I cannot even began to count. The original connectors fail when you un plug and then plug them back in. The internal electrical prongs spring open causing a loose connection. This may not be a problem at first, but I'll bet anything that in a few months your engine will not start; and you will blame the new fuel pump. This can also cause a fire because of the loose connection arcing. It is not worth taking a chance with this connector considering all the work and expence envolved.
The replacement connector has to be spliced into the chassy harness and has 4 wires on it.
Was this
answer
helpful?
Yes
No
Wednesday, January 16th, 2008 AT 12:51 AM

Please login or register to post a reply.

Recommended Guides