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Author
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Topic: fuel pump wont turn on after motor swap?????
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blk86notch
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Member # 6485
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posted
 
 
i just finished my motor swap and a mass air conversion on my 86. When i went to start the car i didn't hear my fuel pump go on??? the car didn't start. I bought a brand new fuel relay (the one under the drivers seat) and i bought a brand new eec relay. i checked the interial switch and it seems good i bypassed it and it still doesn't turn on the fuel pump. The thing is when i turn the ignition i hear a click come from the ecc relay and the relay under the celinode( under the hood. I connected the fuel pump up to power and it works, so i know the fuel pump is still good. i switch back to my old computer and its the same story. I have no idea what the problem is????????????
Posts: 97 | From: california | Registered: Feb 2006
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JohnB
Tech Moderator
Member # 969
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posted
Hook the ground wire up for your injector harness. Either that, or the connector to the TFI isn't plugged in completely.
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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blk86notch
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Member # 6485
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posted
i check both and they are both set up correct. The only way i can get the fuel pump to work is giving a B+ to the interial switch and grounding out the fuel pump test port.
Posts: 97 | From: california | Registered: Feb 2006
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Stan G
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Member # 6226
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posted
Sounds like the fuel pump relay .
check if your relay is turning on.
check backwards for 12 v, on the fuel pump relay.
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1985 RX-7, 347/T-5 , T/F T/W heads, typhoon intake, Tfs2 cam, pulleys, 2500 lbs .
3.63 rear gears , Megasquirt
Posts: 105 | From: Sun Coast , Florida | Registered: Nov 2005
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blk86notch
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Member # 6485
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posted
i already got a brand new fuel pump relay from ford.
Posts: 97 | From: california | Registered: Feb 2006
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westgate331
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Member # 6670
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posted
I had the same problem with mine if u give me a call i will tell u what to do to get it to start. 916-437-9150
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raul
Posts: 11 | From: sac | Registered: Mar 2006
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Stan G
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Member # 6226
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posted
Even though it is a new fuel pump relay, it seems like it isn't closing.
On a 91, at least , ground is always connected to the fuel pump. 12v comes through the relay .
IS it an a9l computer ?
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1985 RX-7, 347/T-5 , T/F T/W heads, typhoon intake, Tfs2 cam, pulleys, 2500 lbs .
3.63 rear gears , Megasquirt
Posts: 105 | From: Sun Coast , Florida | Registered: Nov 2005
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blk86notch
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Member # 6485
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posted
i do have the a9l in it. the fuel pump relay under the seat has 4 wires. The yellow/green wire is reading ground, red/black is reading ground, pink and black is reading ground, and yellow is reading B+. If i get a power off of the battery and put it up straight to the pink/black it will keep the fuel pump on ,but the car wont start????????
Posts: 97 | From: california | Registered: Feb 2006
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Stan G
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Member # 6226
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posted
pk/blk should always have 12v
b y applying power there , it means the relay is closed , assuming it is wired up correctly.
I don't see how to upload a picture, but I'll try to email it to you
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1985 RX-7, 347/T-5 , T/F T/W heads, typhoon intake, Tfs2 cam, pulleys, 2500 lbs .
3.63 rear gears , Megasquirt
Posts: 105 | From: Sun Coast , Florida | Registered: Nov 2005
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Stan G
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Member # 6226
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posted
make that the pk/bl that goes to the relay .
Maybe your wiring has different colors , but you should have 12v on 2 of the relay wires
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1985 RX-7, 347/T-5 , T/F T/W heads, typhoon intake, Tfs2 cam, pulleys, 2500 lbs .
3.63 rear gears , Megasquirt
Posts: 105 | From: Sun Coast , Florida | Registered: Nov 2005
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blk86notch
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Member # 6485
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posted
i am only getting it at the yellow on my color. i believe i am also suppose to get it at the pink and black.
Posts: 97 | From: california | Registered: Feb 2006
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Blind
2.3L
CAFords OG
Member # 3052
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posted
quote:
Originally posted by blk86notch:
i do have the a9l in it. the fuel pump relay under the seat has 4 wires. The yellow/green wire is reading ground, red/black is reading ground, pink and black is reading ground, and yellow is reading B+. If i get a power off of the battery and put it up straight to the pink/black it will keep the fuel pump on ,but the car wont start????????
have you checked for spark?
as johnb said, it sounds like there is something wrong with the fuel injector harness ground or the TFI isn't connected
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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blk86notch
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Member # 6485
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posted
i do have spark i just dont have any fuel pressure. i checked both and they are getting a good ground.
Posts: 97 | From: california | Registered: Feb 2006
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blk86notch
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Member # 6485
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posted
when my ignition is on and i probe the 2 wires on the harness both wires are reading positive. Also i have installed 2000 mustang injectors in it (1986) does anyone think that could be the problem????
Posts: 97 | From: california | Registered: Feb 2006
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Stan G
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Member # 6226
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posted
What are you getting for codes ?
I agree that since it won't start w/ the fuel jumpered and running, there is another problem.
The fuel pump is turned on by pin 4 applying ground.
Something else isn't correct, and the ecu isn't sending the ground to the fp relay.
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1985 RX-7, 347/T-5 , T/F T/W heads, typhoon intake, Tfs2 cam, pulleys, 2500 lbs .
3.63 rear gears , Megasquirt
Posts: 105 | From: Sun Coast , Florida | Registered: Nov 2005
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Blind
2.3L
CAFords OG
Member # 3052
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posted
what year engine harness and fuel injector harness are you using in your `86?
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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blk86notch
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Member # 6485
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posted
i am using both stock 86 harnesses with the mass air conversion harness, whitch i just as 2 pins and splice into a power and a ground and move 3 pins around.
Posts: 97 | From: california | Registered: Feb 2006
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blk86notch
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Member # 6485
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posted
i am actually wondering if anyone knows a really good electrician that could actually come to my house in south san francisco and try to fix whatever it is, that is wrong with my car. I am looking for and real good recommendations.....
Posts: 97 | From: california | Registered: Feb 2006
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Blind
2.3L
CAFords OG
Member # 3052
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posted
and did it run fine before you did the MAF swap changes?
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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blk86notch
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Member # 6485
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posted
i did the mass air conversion and the motor swap all at the same time.
Posts: 97 | From: california | Registered: Feb 2006
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Blind
2.3L
CAFords OG
Member # 3052
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posted
quote:
Originally posted by blk86notch:
i did the mass air conversion and the motor swap all at the same time.
personally I'd take a step back and get it running with the speed density computer.
once you've added the swap harness and the new pins it's easy to go back and forth from SD to MAF config.
one less thing to worry about IMO.
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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SPEC -Fabrication
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Member # 4980
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posted
quote:
Originally posted by blk86notch:
i am using both stock 86 harnesses with the mass air conversion harness, whitch i just as 2 pins and splice into a power and a ground and move 3 pins around.
I bet your using the wrong injector harness, JohnB should be able to tell you, that in a certain yr they used 1 more wire in the harness. Thats where your problem is I bet ![[patriot]](graemlins/patriot.gif)
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1999 Saleen#124
1997 Tahoe
2006 ZX636R
CWS certified welder
Posts: 1321 | From: drinkin BEER! | Registered: Oct 2004
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blk86notch
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Member # 6485
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posted
i did not use the harness that i bought from you. The harness that you sold me doesn't work for a mass air harness. and also i use my stock 86 injecoter harness and main harness. also i got my car to start after i switch computers with a buddy of mines a9l.
Posts: 97 | From: california | Registered: Feb 2006
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