MAF conversion fuel pump issue NEED HELP

PR_wingman

New Member

Feb 2, 2006

20

0

0

Jupiter, Florida

Jan 15, 2010

#1

• Jan 15, 2010

• #1

I converted from Speed density to MAF on my 87 GT today, so far so good but the fuel pump does not turn off after priming. If I leave the ignition in the on position the fuel pump stays on all the time.
Did I miss something?
Note: the wires for the fuel pump relay and speed sensor are wired up to the EEC-IV harness but not connected to the relay yet. I'm using a A9P EEC out of a 89 GT.

 

liljoe07

5 Year Member

Feb 18, 2009

1,622

363

124

Cartersville,Ga

Jan 15, 2010

#2

• Jan 15, 2010

• #2

Have you tried another relay for the fuel pump? The ECM controlls the ground to activate the relay. But the relay could be stuck. If the ECM is at fault, then I really wouldnt worry about it. I dont see the need to spend $80-$100 bucks on a ECM, just so the pump primes like it should. Unless youre real picky.

 

PR_wingman

New Member

Feb 2, 2006

20

0

0

Jupiter, Florida

Jan 15, 2010

#3

• Jan 15, 2010

• #3

I tested the relay and is working properly and it was working fine (shutting off after priming) this morning before I swapped the ECM and converted to MAF.

 

liljoe07

5 Year Member

Feb 18, 2009

1,622

363

124

Cartersville,Ga

Jan 15, 2010

#4

• Jan 15, 2010

• #4

You can test the ECM controlled ground with a test light. Just remove the fuel pump relay. Hook the clip on the test light to the constant 12v source on the relay plug, and probe the tan/light green wire. Turn key on, test light should light up, then go off. Thats the ECM priming the pump.

 

PR_wingman

New Member

Feb 2, 2006

20

0

0

Jupiter, Florida

Jan 16, 2010

#5

• Jan 16, 2010

• #5

Problem fixed.
I swapped the A9P ECM to a A9L and the fuel pump relay is working properly now also my mustang is running better than ever.

Thanks Stangnet!!!!!