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mpi

iceman69510

Turn Right Racing
Staff member
Joined
Mar 5, 2001
Messages
10,964
Location
Michigan
No. The MPI relay is integral to the operation of the fuel injection control system. The rewire is only to provide a more consistent direct voltage source to the pump.
 

92_talon_awd

Well-known member
Joined
Feb 11, 2014
Messages
456
Location
Knoxville, TN
It could mean your pump is bad. Apply power to the test connector and then check for voltage at the pump connector to make sure you don't have a wiring problem. You can also supply power and ground directly to the pump with jumper wires to check it. When I bought my GGSX, the fuel pump didn't cycle on. I removed all the little nuts that hold it into the tank and while my buddy cycled the key on and off, I banged the pump up and down a few inches against the tank. It came on and I drove it like that for months without a problem until I got around to replacing it.
 

marvinmadman

Well-known member
Joined
Nov 10, 2003
Messages
2,355
Location
Lafayette, Louisiana
But, in stock form, the pump won't run until it sees the CAS rotate. How did you get it to run by just cycling the key?
 

kkmcgregor

Active member
Joined
Oct 9, 2015
Messages
36
Location
Lexington, Kentucky
Alright finally got around to bench testing my mpi according to this link click . When I did I didn't get voltage to the pins just continuity, does this seem like a bad relay. Also after hooking everything back up and trying to start the car my afpr read 40 psi. Does this mean the fuel pump is now working?
 

marvinmadman

Well-known member
Joined
Nov 10, 2003
Messages
2,355
Location
Lafayette, Louisiana
Pump is definitely working for it to be pumping out 40 psi.
 
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