2000 s10 4x4 4.3 fuel problems/ oil pressure switch ?


donavon
12-07-2008, 01:50 PM
Fuel pump not turning on. Replaced fuel pump. Pump not coming on when turning key. Used scanner no codes . Trying to locate the oil pressure cutoff switch. For possible cause. Thanks

MT-2500
12-07-2008, 05:36 PM
It does not have one.
On the older ones that do have a oil pressure switch for fuel pump it is not a cut off switch but is to keep fuel pump running if the fuel pump relay fails as long as there is oil pressure.

Check the EMC-B fuse to the fuel pump relay
Switch relay with a known good one.
Also make sure you have spark from coil.
AND ALSO JUMPER GRAY FUEL PUMP WIRE TO SEE IF FUEL PUMP RUNS.

Does the pump run on engine cranking or have any fuel pressure?
Is the gray fuel pumpfeed wire getting 12 volts engine crank or key on 2 second prime up?

donavon
12-10-2008, 05:17 PM
Pump does not run on cranking. No pressure. Fuse is ok installed new relay Put power to gray wire fuel pump doesn't kick on. I haven't replaced fuel filter. Will start and die if I use starting fluid.

MT-2500
12-10-2008, 05:51 PM
If pump does not go with gray fuel pump wire jumped and pump hs a good ground.
Check for 12 volts on gray wire with it jumped at fuel pump plug and also for ground there.
If voltage and ground there replace fuel pump.
And use a Ac-Delco/delphi pump.

donavon
12-10-2008, 05:55 PM
Its aftermarket pump Bosch

MT-2500
12-11-2008, 09:32 AM
Run the test and see if it is fuel pump or other.
Post back results.
Good luck

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