Fuel pump
supervisor1886
04-04-2005, 02:01 AM
Is there 1 or 2 fuel pumps on a 87 2.8 camaro?
Would a f/p relay failure lead to no fuel pressure and no start ?
Would an oil pressure sending unit lead to the same condition?
Is it worth to replace the relay before replacing the pump?
Is there an in-line fuse for the pump and where is it?
The car starts but fails to run, no humming noise!
Is there a way to test all this?
P.S.
Is there a way to cut down on the cost of the repair?
Would a f/p relay failure lead to no fuel pressure and no start ?
Would an oil pressure sending unit lead to the same condition?
Is it worth to replace the relay before replacing the pump?
Is there an in-line fuse for the pump and where is it?
The car starts but fails to run, no humming noise!
Is there a way to test all this?
P.S.
Is there a way to cut down on the cost of the repair?
Genopsyde
04-04-2005, 02:07 AM
the fuel pump fuse is mounted on the inner fender by the battery.
Test the relay with a volt meter, if it passes, it's probably the pump. There's also a way to test the pump from under the hood, but I don't remember. Someone else will chime in on that one.
Test the relay with a volt meter, if it passes, it's probably the pump. There's also a way to test the pump from under the hood, but I don't remember. Someone else will chime in on that one.
supervisor1886
04-05-2005, 03:21 AM
The thing is that i dont wanna go thu all that shit with the pump untill iam comletely sure. Maybe its just the damn oil pressure sending unit or the relay, or a bad ground (would be funny). What is strange that theres no codes on the ecm.
89IROC&RS
04-05-2005, 10:00 AM
there is only one fuel pump, located inside the fuel tank, so i can understand your hesitance to replace it. Taking out the tank can be a pain in the ass.
The fuel pump relay is on the driver side firewall, i think its the one closest to the fender, but i dont have my books here with me to verify.
Geno is correct that there is an inline fuse for the fuel pump between the battery and coolant overflow tank on the passenger side fender.
A bad oil pressure sensor would cause this problem in some newer cars, although im not sure about an 87, it might, it might not, what is your oil pressure guage reading while its running?
Also, you say that there is no humming noise, what about when you first get in the car, and just turn the key to the run position without cranking it? you should hear the fuel pump priming the system for about two seconds. If it primes they system, id say the pump is fine and you have another problem. When was the last time you changed your fuel filter? If that is clogged it would create the problem you are seeing, but i would have thought it would set a lean condition error code.
A way to make the repair cheaper is to do the work yourself of course. And to get your parts from www.GMpartsdirect.com, i use that website from time to time and have found that their prices are almost as low as what i payed for things with my employee discount when i was working at a chevy dealership. Only downside is you have to wait for them to be shipped to you, no instant gratification.
My suggestion is to start with the fuel filter, its only like 12 bucks and is a no brainer to install. Given your symptoms i kinda feel that is your problem, and it certainly wont hurt anything if its not.
The fuel pump relay is on the driver side firewall, i think its the one closest to the fender, but i dont have my books here with me to verify.
Geno is correct that there is an inline fuse for the fuel pump between the battery and coolant overflow tank on the passenger side fender.
A bad oil pressure sensor would cause this problem in some newer cars, although im not sure about an 87, it might, it might not, what is your oil pressure guage reading while its running?
Also, you say that there is no humming noise, what about when you first get in the car, and just turn the key to the run position without cranking it? you should hear the fuel pump priming the system for about two seconds. If it primes they system, id say the pump is fine and you have another problem. When was the last time you changed your fuel filter? If that is clogged it would create the problem you are seeing, but i would have thought it would set a lean condition error code.
A way to make the repair cheaper is to do the work yourself of course. And to get your parts from www.GMpartsdirect.com, i use that website from time to time and have found that their prices are almost as low as what i payed for things with my employee discount when i was working at a chevy dealership. Only downside is you have to wait for them to be shipped to you, no instant gratification.
My suggestion is to start with the fuel filter, its only like 12 bucks and is a no brainer to install. Given your symptoms i kinda feel that is your problem, and it certainly wont hurt anything if its not.
supervisor1886
04-06-2005, 08:28 PM
I got no fuel pressure at all. The pump doesnt work or theres a problem in the circuit. I remember there was a lean code and i replaced my maf censor- it helped and the ecm doesnt have any codes on it. Il do it step by step, Fuses, Relay, then pump. The engine run out of gas and starts for 2 seconds and fails to run and iam not really sure a relay would cause the motor not to run, exsesive cranking maybe.Thanks for the info, I really appreciate it
89IROC&RS
04-07-2005, 12:56 PM
ok well if it starts and runs at all, then its not the pump, youre getting gas to the injectors. What you should look at is the schematics of the fuel pump wiring. You should see two seperate circuits. One for the priming system that pressurises the lines, and the other is the run circuit. It sounds to me like you have an open in the run circuit to the pump, be it a relay, a fuse, or a broken wire at some point.
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