Fuel pump?

[baswm]

97 GMC k1500 suburban. 5.7 liter engine.

 

Truck left me sitting on my lot last night. Would crank and crank but not start up. I cannot hear the fuel pump whirr when turned to on position. I took test light and checked all fuses. All are good. I read to take a 10 amp fused jumper wire from battery and touch it to the fuel pump test terminal which I do not know where it is. Wondering if it is under the fuel pump relay. Anyone know?

 

Last month the truck died on me on the highway. I thought fuel pump then but dealer said it was a short somewhere because of blown fuse. They finally found it to be the wire harness going to crank position sensor was shorted and fixed it. Ran fine until a week ago I noticed it would not start right up. Before I could hit the key and she would fire up. Last few days it would fire up after about 4 to 5 seconds. Now it left me sitting. I tried to bang on the fuel tank while my wife cranked it over hoping it may be intermittent and fire up. No luck. I left the truck on my lot and rode home with the wife.

 

On alldata website, they say fuel pump GM# is 25312959 and GMPARTSDIRECT has part number 25163473 for the fuel pump. Anyone know which is the complete assembly?

 

Thanks in advance

 

Bill

[71GMC_3/4T]

I think I'd be taking a closer look at the crank position sensor and the harness that was fixed (hacked?).

 

If it was a bad fuel pump, banging on the tank should have brung her back to life for one more time at least.

 

Check for spark. If you ain't got it, fuel probably isn't your problem...

[baswm]

I think I'd be taking a closer look at the crank position sensor and the harness that was fixed (hacked?).

 

If it was a bad fuel pump, banging on the tank should have brung her back to life for one more time at least.

 

Check for spark.  If you ain't got it, fuel probably isn't your problem...

 

<{POST_SNAPBACK}>

 

 

 

 

I will try to go down there tonight and check for spark. If it has spark, then fuel

pump may be the answer. Also will borrow an OBD II reader and see if any codes are in it conserning the crank position sensor.

[builderpaul]

I think I'd be taking a closer look at the crank position sensor and the harness that was fixed (hacked?).

 

If it was a bad fuel pump, banging on the tank should have brung her back to life for one more time at least.

 

Check for spark.  If you ain't got it, fuel probably isn't your problem...

 

<{POST_SNAPBACK}>

 

 

 

 

I will try to go down there tonight and check for spark. If it has spark, then fuel

pump may be the answer. Also will borrow an OBD II reader and see if any codes are in it conserning the crank position sensor.

 

<{POST_SNAPBACK}>

 

 

 

 

Borrow a fuel pressure guage. Since you can't hear the pump seems like a good place to start. In a pinch you can wrap a rag around the shrader valve and briefly pres in the center stem. If a spray (not a drip) of fuel comes out you have pressure.

If you don't have a check engine light a reader isn't going to help much. If you can borrow a scanner it would give you much better info.