2000 Jimmy Slt - Cold Start Fuel Issues

[00jimmysle]

The Icon to the left summarizes my situation perfectly.

 

Just brought my Jimmy to a local shop who specializes in suv/domestic trucks. After replacing my engine temp sensor, fuel filter, battery (because my mechanic said mine was bad after he drained due to unsuccessful starting attempts) - still no fix - then there was the replacement of the idol speed control valve, and the fuel pressure regulator (with the upper intake plenum gasket, of course).

 

After conducting the above repairs, he wanted to make sure it would start, so he kept it for another evening. I was surprised to hear his final diagnosis...we are right where we left off...a Jimmy that still would not start cold. He now thinks I need a new fuel pump (something he could have checked throughout the process).

 

I have paid this fool over $900 for the repairs...need help.

 

Turn key to on position...pressure to schraeder is at 55psi (hear fuel pump cycling and turning off after 3-4 seconds)...continue to turn key (sudden drop in pressure to 40psi)-then pump re-starts, and back to 55psi...turn key further to engage starter, start. If I do not let the pump cycle a second time (by turning the key very slowly) pressure will stay at the jumped down 40-45psi while starter kicks in. Is this the ignition switch, or is the fuel regulator cycling the fuel back to the tank for a brief moment, or is the fuel pump bad (changed 5000 miles ago)?

 

Any help will be more than appreciated.

[ez1969]

I seem to have the same problem you descibe with my 2000 Jimmy. Did you ever figure out what it was? Thanks!

 

The Icon to the left summarizes my situation perfectly.

 

Just brought my Jimmy to a local shop who specializes in suv/domestic trucks. After replacing my engine temp sensor, fuel filter, battery (because my mechanic said mine was bad after he drained due to unsuccessful starting attempts) - still no fix - then there was the replacement of the idol speed control valve, and the fuel pressure regulator (with the upper intake plenum gasket, of course).

 

After conducting the above repairs, he wanted to make sure it would start, so he kept it for another evening. I was surprised to hear his final diagnosis...we are right where we left off...a Jimmy that still would not start cold. He now thinks I need a new fuel pump (something he could have checked throughout the process).

 

I have paid this fool over $900 for the repairs...need help.

 

Turn key to on position...pressure to schraeder is at 55psi (hear fuel pump cycling and turning off after 3-4 seconds)...continue to turn key (sudden drop in pressure to 40psi)-then pump re-starts, and back to 55psi...turn key further to engage starter, start. If I do not let the pump cycle a second time (by turning the key very slowly) pressure will stay at the jumped down 40-45psi while starter kicks in. Is this the ignition switch, or is the fuel regulator cycling the fuel back to the tank for a brief moment, or is the fuel pump bad (changed 5000 miles ago)?

 

Any help will be more than appreciated.

[Tex2kZR2]

The problems he described are definitely pointing to a bad fuel pump. The fuel pump should run at a pressure of 61psi - 63psi, and should be rock steady. There should be no fluxuation in pressure even if you throttle it up.