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Hughie

Hughie 4/21/2012

1996 GMC C1500 Sierra SL 8 Cyl 5.70L

Engine

will not crank, no fuel to injectors

changed all sensors and fuel pump and pressure regulator

3 Answers


jdl

jdl 4/21/2012

Are you saying the starter motor won't crank, or it cranks good but won't start? When you first turn the key on, no crank, can you hear the fuel pump run for a few seconds?

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jdl

Hughie 4/21/2012

everythings working but no gas to injectors fuel to regulator but no futher

jdl

jdl 4/21/2012

Use a gage and check fuel pressure. Those spider fuel systems are known for problems. Do you have an injector pulse? Any applicable trouble codes?

jdl

Hughie 4/21/2012

no codes pressure good where and what is an injector pulse? going down road and quit, will not crank changed everything but injectors

jdl

jdl 4/21/2012

I tried to post again but the site wouldn't let me.

karl blohm

karl blohm 4/22/2012

can a bad ignition switch shut down the fuel pump

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HouseCallAuto

HouseCallAuto 4/22/2012

Insufficient info to help you. Does the engine have ignition spark? Yes or no. Don'y just say "everything works". Ok, no codes, great. When you turn the key to "on" (not crank) do you hear the fuel pump turn on and run for two seconds and stop? - Yes or no answer only. If there is apark and you can hear the fuel pump, attach a fuel pressure gauge to the schrader valve on the fuel rail and read the fuel pressure. Is the pressure reading between 56 and 62 psi?

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HouseCallAuto

karl blohm 4/23/2012

thanks for your ?s.Yes spark plugs are getting spark,don't have tester to see if there's any codes,when turning key to on position f/pump does not go on at all,when turning the key to start starter still does'nt,but when i release the key in starter position back to on position f/pump goes on for sbout 4 seconds & shuts off!!! I hooked wires with alagator clips to the connections neg & positive lines from the van where the f/pump connections would go & hooked it up to f/p lines dry tested it

HouseCallAuto

HouseCallAuto 4/23/2012

I need you to confirm that the fuse labeled ECM B is good and has battery voltage at both sides, even with the key off. Then we can continue.

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