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Fuel pump relay?

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The other source, for the coil side of relay comes from the pcm. This one will be coming from the PCM dark green wire ckt 465 that powers the coil side from there it will power the gray that goes to the fuel pump when the switch side close. The OPS is the additional power when the engine cranks and build up oil pressure above 4psi.


https://www.2carpros.com/forum/automotive_pictures/12900_oil_sending_unit_and_fuel_pump_circuit_95.gif

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Wednesday, October 21st, 2020 AT 6:15 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hello, Rasmataz and Docfixit, I didn't see you guys, I guess I'm going blind or something? Everybody have a nice day.
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Wednesday, October 21st, 2020 AT 6:15 PM (Merged)
Tiny
BIG BUFFORD
  • MEMBER
  • 2 POSTS
  • 1991 CHEVROLET CAMARO
1991 Chevy Camaro V8 Two Wheel Drive Automatic

Theres fuel to the injected carburator but no fuel comes out injectors. Is there a fuel relay & where would it be. Thx.
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Wednesday, October 21st, 2020 AT 6:16 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Welcome to the forum, I'd use a gage and check fuel pressure. Voltage to the injector/s goes hot when you turn the key on, the computer pulses the ground to open and close injector, engine cranking.


https://www.2carpros.com/forum/automotive_pictures/170934_camaro_fuel_pump_relay_1.jpg



The fuel pump relay is underhood, driver side firewall, C3 in the picture.
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Wednesday, October 21st, 2020 AT 6:16 PM (Merged)
Tiny
BIG BUFFORD
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  • 2 POSTS
How much fuel pressure should I have in a 1991 camaro, I believe it's a 350
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Wednesday, October 21st, 2020 AT 6:16 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
My info says, 34-47 psi.
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Wednesday, October 21st, 2020 AT 6:16 PM (Merged)
Tiny
ANDREW DULYA
  • MEMBER
  • 1 POST
  • 1996 CHEVROLET CAMARO
Computer problem
1996 Chevy Camaro 6 cyl Two Wheel Drive Automatic

I tried starting the car with a dead battery and used a charger with high amperage boost. I burned out the headlights during a power test. I replaced the battery, and will not start. No fuel pressure. All the fuses test OK. There is power to the fuel pump relay, and works if jumper wired. Used a code scanner, with " will not communicate with the vehicle"Do you think I burned out the power control unit? Where is it located? How can I test for power to it? Thanks for your help.
Andy D.
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Wednesday, October 21st, 2020 AT 6:16 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
A big no no with computer controlled cars is to NEVER leave the key on while the vehicle is being jumped. Always wait until the power is connected before turning the key on due to voltage spikes. BUT, check by your starter or where the large battery cables go(positive) to see if you have a fusible link that has burnt up. That protects your car for things like this. You'll see it it is smaller wire connected to bigger wire and it will lookburnt up. They are available at auto parts stores.
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Wednesday, October 21st, 2020 AT 6:16 PM (Merged)

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