fuel pump relay problem

[MT-2500]

Some parts places have or can get the dealer OEM type Ac-delco/delphi fuel pump.
May be 1 - 2 hundred dollars cheaper at parts place.
Always ckeck and price both places.
Let us know how it goes
Good luck

[j cAT]

Originally Posted by racint

I did recently replaced the fuel filter then I took the fuel pressures. They are on the post two up from this one. I recently replaced the regulator with in 2000 miles ago. I was having a hard time starting it and when I put intake gaskets on I found fuel in the regulator vacum line so I replaced it and the vacum line also. It took care of my had to start problem. It looks like it has good fuel pressure at prime just low running. I will look into putting a new fuel pump with sending unit also since my fuel gague is fluttering also. I will only put a fuel pump on from the dealer. Thank you

thanks for the feedback ..let the forum know how you made out ...check the pressures after the fuel pump is replaced and recheck that new fuel pump current ...good luck..

[solo2r]

Ok Gang,
My '03 Silver extra cab, 5.3 ,auto vin 'T' just plain died on me last night while in a left turn lane. Went to try and restart but would not even crank. All lights worked and did not dim when trying to crank. I thought how bizaar. AAA towed it a couple miles to my home and I looked at it this morning. I tried to scan it with a Tech 2 but no data. I noticed the check eng lite did not come on at all so I proceeded to look at a wiring diagram to find ecm B fuse blown. That fuse goes to trans cont, Ecu, and fuel pump relay. I put a new fuse back in and everything worked/started. Fuse blew in about 50 seconds and engine died again. To isolate problem, I first took the [suspected] fuel pump relay out and ran my own fuse to the '30' socket. Put another fuse back in and started and 'my' fuse blew in about 50 seconds....... BUT...Engine stayed running! WTF? Engine runs without the fuel pump relay!???????
Ran it about a minute..it does not seam to run right but runs none the less.
It is like there is a primary and secondary pump set up but this truck is completely stock, never been messed with.
Thoughts? short to power? Anybody else have this happen?

Thanks,
Mark

[MT-2500]

Originally Posted by solo2r

Ok Gang,
My '03 Silver extra cab, 5.3 ,auto vin 'T' just plain died on me last night while in a left turn lane. Went to try and restart but would not even crank. All lights worked and did not dim when trying to crank. I thought how bizaar. AAA towed it a couple miles to my home and I looked at it this morning. I tried to scan it with a Tech 2 but no data. I noticed the check eng lite did not come on at all so I proceeded to look at a wiring diagram to find ecm B fuse blown. That fuse goes to trans cont, Ecu, and fuel pump relay. I put a new fuse back in and everything worked/started. Fuse blew in about 50 seconds and engine died again. To isolate problem, I first took the [suspected] fuel pump relay out and ran my own fuse to the '30' socket. Put another fuse back in and started and 'my' fuse blew in about 50 seconds....... BUT...Engine stayed running! WTF? Engine runs without the fuel pump relay!???????
Ran it about a minute..it does not seam to run right but runs none the less.
It is like there is a primary and secondary pump set up but this truck is completely stock, never been messed with.
Thoughts? short to power? Anybody else have this happen?

Thanks,
Mark

You need to start aNew Thread on your poroblem.
If it is set up with a oil pressure switch for fuel pump the oil pressure switch will run the fuel pump if relay fails untill you shut engine off or oil pressure goes down.
To find the short you will need to start unplugging stuff on that ECM B fuse circuit untill you find what is blowing fuse.