82 Fuel pump problem
Thread Starter
5th Gear
Joined: May 2006
Posts: 5
Likes: 0
From: San Leandro Ca
82 Fuel pump problem
My 82 would not start. I put some gas in the manifod and the engine started, ignition good- fuel the problem. When turning the key I could hear the fuel pump run for a short time and shut off as if a pressure switch was controlling the pump. The wiring diagram indicates the circuit consist of the pump, fuel pump relay, oil pressure switch ( 3 wires ) that I can not locate, fuse and the ECM. I changed the pump and no help. Same indication: key on, pump runs 2-3 seconds then off. Wait a minute then it will do the same. Suggestions!
Melting Slicks
Joined: Jul 2007
Posts: 2,063
Likes: 17
From: Lee's Summit MO
The main issue with the Crossfire is fuel pressure. My first thought would be fuel pump bad, but you said you changed the pump. Next would be a clogged fuel filter or the fuel pressure regulator.
Are you getting spray at the injectors when you turn it over?
Also, there is a very common problem with '82's; there is a rubber hose going from the fuel pump to the fuel line. This hose deteriorates and dumps the fuel back into the tank. Therefore there is not enough pressure in the line to feed the injectors. I noticed it when I was replacing my pump.
I'm not an expert on the crossfire, but I've learned a great deal from the Crossfire Injection Vault website.
Those guys ARE experts, so you might want to join and post over there. They can get you the answer better than I can.
Crossfire Injection Vault
Are you getting spray at the injectors when you turn it over?
Also, there is a very common problem with '82's; there is a rubber hose going from the fuel pump to the fuel line. This hose deteriorates and dumps the fuel back into the tank. Therefore there is not enough pressure in the line to feed the injectors. I noticed it when I was replacing my pump.
I'm not an expert on the crossfire, but I've learned a great deal from the Crossfire Injection Vault website.
Those guys ARE experts, so you might want to join and post over there. They can get you the answer better than I can.
Crossfire Injection Vault
Last edited by Luster; Aug 14, 2008 at 12:10 PM.
Instructor
Joined: Feb 2005
Posts: 224
Likes: 0
From: Boston Massachusetts
Hi,
I think Luster gave you good information. The ECM will run the fuel pump for a 2 second prime pulse, then the motor should fire. The ECM is also looking for oil pressure, and won't let the engine start without it. The switch for the oil pressure gauge is on the left side of the motor down towards the oil pan, but I'm not sure where the ECM gets the low oil signal. Did you replace the sock filter when you installed the new pump? There is also a filter on the frame behind the right front wheel. It could be a blocked filter, take off the air cleaner and see if the injectors are spraying.
Good luck
Tom
I think Luster gave you good information. The ECM will run the fuel pump for a 2 second prime pulse, then the motor should fire. The ECM is also looking for oil pressure, and won't let the engine start without it. The switch for the oil pressure gauge is on the left side of the motor down towards the oil pan, but I'm not sure where the ECM gets the low oil signal. Did you replace the sock filter when you installed the new pump? There is also a filter on the frame behind the right front wheel. It could be a blocked filter, take off the air cleaner and see if the injectors are spraying.
Good luck
Tom
Burning Brakes
Joined: Jan 2006
Posts: 1,154
Likes: 1
From: St Augustine FL
Hi,
I think Luster gave you good information. The ECM will run the fuel pump for a 2 second prime pulse, then the motor should fire. The ECM is also looking for oil pressure, and won't let the engine start without it. The switch for the oil pressure gauge is on the left side of the motor down towards the oil pan, but I'm not sure where the ECM gets the low oil signal. Did you replace the sock filter when you installed the new pump? There is also a filter on the frame behind the right front wheel. It could be a blocked filter, take off the air cleaner and see if the injectors are spraying.
Good luck
Tom
I think Luster gave you good information. The ECM will run the fuel pump for a 2 second prime pulse, then the motor should fire. The ECM is also looking for oil pressure, and won't let the engine start without it. The switch for the oil pressure gauge is on the left side of the motor down towards the oil pan, but I'm not sure where the ECM gets the low oil signal. Did you replace the sock filter when you installed the new pump? There is also a filter on the frame behind the right front wheel. It could be a blocked filter, take off the air cleaner and see if the injectors are spraying.
Good luck
Tom
Melting Slicks
Joined: Jul 2005
Posts: 2,740
Likes: 3
From: Aurora Ontario
When you are kicking it over watch the oil pressure gauge...it it gets over about 9 psi thats all it needs. Thats not to say the sensor is not faulty.
Pop the hood in the morning. Take the air cleaner off. Turn the key and listen for the pump. Right after you should see a prime pulse from the injectors. Are you getting the prime pulse? Check the injector fuses...2 of them. Check the ECM fuse in the battery compartment.
Do you get any spray from the injectors when kicking it over? Even a dribble? Put a test light on the injectors they light should blink as the pulse while kicking it over. if the are pulsing they are working.
Jim
Pop the hood in the morning. Take the air cleaner off. Turn the key and listen for the pump. Right after you should see a prime pulse from the injectors. Are you getting the prime pulse? Check the injector fuses...2 of them. Check the ECM fuse in the battery compartment.
Do you get any spray from the injectors when kicking it over? Even a dribble? Put a test light on the injectors they light should blink as the pulse while kicking it over. if the are pulsing they are working.
Jim
Last edited by jdp6000; Aug 16, 2008 at 10:48 AM.
