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Chevrolet S10 4x2: 1995 s10 will not run. After a lot of cranking…

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1995 s10 will not run...
1995 s10 will not run. After a lot of cranking it will start
sometimes but only run a few seconds and shut off. I have replaced the
fuel pump and fuel filter. Checked for battery voltage at the relay and
pump, they are battery voltage. I had a code 54, relay but it functions
as it should.
Submitted: 3 years ago.Category: Chevy
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Answered in 16 minutes by:
6/13/2015
Chevy Mechanic: Gary, Chevy Technician replied 3 years ago
Gary
Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 18,026
Experience: 15 years GM master tech
Verified
will the engine run on starting fluid or carb cleaner being sprayed into the butter fly ?
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Customer reply replied 3 years ago
Yes, it will run on carb cleaner. I am wondering if it may be the oil pressure switch. The gauge work just fine.
Chevy Mechanic: Gary, Chevy Technician replied 3 years ago
the oil pressure gauge will just run the fuel pump if the computer can not control the fuel pump relaycan you see what the fuel pressure is when it will not start key ON engine OFF ?if you unplug the fuel pump relay and jump the orange terminal wire to the grey wire terminal will the truck run ?
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Customer reply replied 3 years ago
I do not currently have a large enough piece of hose to test the fuel pressure. On the relay, I cannot see behind so I cannot determine wire color. I do know the top two terminals are battery voltage. That leaves the bottom two terminals, which is which?
Chevy Mechanic: Gary, Chevy Technician replied 3 years ago
on the relay are there little numbers that show which terminal is which on the relay ?if so you want to jump #30 to # ***** in the box the relay plugs into and that should hot wire the pump to runand see if the truck will run
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Chevy Mechanic: Gary, Chevy Technician replied 3 years ago
3 to 5
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Customer reply replied 3 years ago
I connected jumper between 3 and 5, the fuel pump runs. It only started once and died after a few seconds.
I'll get the fuel pressure test done tomorrow unless you can think of anything else.
Chevy Mechanic: Gary, Chevy Technician replied 3 years ago
so the pump will run when jumped even when it dies the pump is running ? if so we need to be sure we have enough fuel pressure next
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Customer reply replied 3 years ago
Yes, it dies even when the pump is running. 42 psi, tested it three times and it holds pressure.
Chevy Mechanic: Gary, Chevy Technician replied 3 years ago
can you keep it running with carb cleaner or starting fluid ?
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Customer reply replied 3 years ago
Yes, it will keep running on carb cleaner. I had already tried this as you suggested.
Does the 95 model year have a passlock system?
Chevy Mechanic: Gary, Chevy Technician replied 3 years ago
no it does noti am wondering if you are looking your injector pulse can you see when it will not run if you have an injector pulse with a noide light while cranking it over ?
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Customer reply replied 3 years ago
I tested with a noid light just on one cylinder and it appears to be pulsing correctly.
Chevy Mechanic: Gary, Chevy Technician replied 3 years ago
the other 3 are not ?do the none pulsing injectors with the key on show 12 volts on one of the terminals in each connector ?
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Customer reply replied 3 years ago
I was able to pulse check #2, #3, & #4. All tested good for pulse. I cannot access #1 without some removal of the intake.
Customer reply replied 3 years ago
Okay, it's been almost 3 days, is anyone going to reply??
Customer reply replied 3 years ago
As per the wiring diagram the oil pressure switch is part of completing the circuit. I replaced the oil pressure switch, it will run a few seconds longer now but still dies even with the the fuel pump relay being by-passed.
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