2002 Silverad 4.3 v6 fuel pump and fuel injector will not fire

tehfxr

Original poster
Member
May 10, 2015
4
Hi, I'm on a mobile device and it's not easy to type. Please forgive my lack of pleasentries.

Replaced fuel pump and relay. If I jump relay the pump runs and builds fuel pressure. The truck will run if I put fuel down the throttle body.

So I feel the ecu is bad and not telling the fp and FI to fire.

Before I go spending another wasted 300$ on a mis diagnosis, I would like your opinion.

Thank you
Ed
 

felicie

Member
Jan 13, 2013
171
Did you check to see if the computer is turning on the relay? If yes, I know it sounds backwards of me but did you check the fuse?
 

djthumper

Administrator
Nov 20, 2011
14,950
North Las Vegas
What all troubleshooting have you already completed? Do you know if you have any pending codes?
 

tehfxr

Original poster
Member
May 10, 2015
4
No codes and I checked all fuses under the hood and in the driver's side panel. All are good fuel pump circuit will run if I jump across the relay. The ECM side of the fuel pump relay lights up for a second when the ignition is initialized. I took the ECM apart and the board looks fine under magnification and there is no smell. Totally at a loss on this one.
 

djthumper

Administrator
Nov 20, 2011
14,950
North Las Vegas
You jumped across the relay? Or the relay socket? Maybe that is where your problem is at.
 

djthumper

Administrator
Nov 20, 2011
14,950
North Las Vegas
Have you tested and verified that the relay is good?
 

felicie

Member
Jan 13, 2013
171
Have you checked the socket for spreading or corrosion?
 

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