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Old 12-03-2007, 08:53 AM   #1
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Default 2.9 fuel pump relay location

This should be a no brainer for you guys, I'm trying to find the fuel pump relay on my '86 B2 2.9l. I just bought the truck for a song because the previous owner could not start the thing. I immediately noticed that I couldn't hear the fuel pump running. I confirmed that no power is being sent when I put a test light on the inertia switch. Unfortunately I don't have an owners manual, or repair manual yet, buy that is next on my list. Future plans: get it to run!
Thanks, Colin
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Old 12-03-2007, 04:18 PM   #2
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On the metal panel on the passenger side inner fender.

It may be hidden with a plastic cover between the fender and
the air cleaner box.

I can never remember which relay is which... There are three relays down there.
One black which is for the A/C wide open throttle cutout.

the ones I always confuse are the brown one and the green one.
One is the EEC Power Relay the other is for the fuel pump.
And I simply can't remember which is which...

Yeah, I have an '87, but I can't run outside and look,
I converted my '87 to a '93 4.0 and used the wiring from
the '93 Explorer I used as a donor.

AD
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Old 12-03-2007, 05:10 PM   #3
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Quote:
Originally Posted by AllanD View Post
the ones I always confuse are the brown one and the green one.
dont feel bad, i do the same thing. i *think* its the brown one. and until now, i didnt know what the 3rd one was for.
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Old 12-03-2007, 05:56 PM   #4
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Green is fuel, brown is ECC.

ECC could be out as that opens the circuit for the fuel pump relay (see wiring diagram on autozone or something.) Could also be a fuse link.

Well, back to drinking beer.



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Old 12-03-2007, 10:41 PM   #5
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Default

Thanks for the fast advice guys! I had the hood open for five minutes today before I froze. I hope tomorrow morning is not as windy, so I can get in there and check it out.

Psychopete, are you suggesting that if the relay, harness, fuse links etc... all look to be okay, or should I say do not have power going to them, that the problem could be the computer itself and need to be replaced? Is this a common problem for these trucks.
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Old 12-04-2007, 04:03 PM   #6
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Quote:
Originally Posted by colin-pm View Post
Psychopete, are you suggesting that if the relay, harness, fuse links etc... all look to be okay, or should I say do not have power going to them, that the problem could be the computer itself and need to be replaced? Is this a common problem for these trucks.
I wouldn't rule it out, but a bad PCM is EXTREMELY uncommon. Even if the PCM isn't getting powered itself (from the brown relay), obvious the PCM is not going to be able to turn on the pumps.

Seriously, get on autozone, look at the repair guides, under chassis electrical, then get to wiring diagrams. You'll see your engine listed. The wiring colors are not right, but the circuits generally are. It's a lot easier when you can "see" how it works.

Pete
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Old 12-14-2007, 10:39 PM   #7
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Default hi

what's the ECC...

Common Engine Terms:

FPR - fuel pressure regulator
MAP - manifold absolute pressure (sensor)
MAF - mass air flow (sensor)
TPS - throttle position sensor
TFI - Thick Film INTEGRATED (not Ignition)
HEGO or O2 - (heated exhaust gas) oxygen (sensor)
ACT - air charge temperature (sensor)
CTS - coolant temperature sensor
EGR - exhaust gas recirculation (valve)
IAC - Idle air control (bypass valve)
CANP - (charcoal) cannister purge (valve)
EEC - evaporative emission control (charcoal cannister and related components)
PCM - powertrain control module (computer)
CEL - check engine light (old)
MIL - malfunction indicator lamp (modern -- not all malfunctions are in the engine)
DTC - diagnostic test code
KOEO - key on/engine off
KOER - key on/engine running
SPOUT - spark output (a wire that can be disabled by removing a connector on TFI-IV equipped engines)
FRP - Fuel Rail Pressure Sensor
FTP - Fuel Tank Pressure
EVMV - Electronic Vapor Management Valve (modern version of the CANP)
VSS - Vehicle Speed Sensor
GEM - Generic Electronic Module
FMEM - Failure Mode Effects Management
KAM - Keep Alive Memory
EFI - Electronic Fuel Injection
CFI - Central Fuel Injection
SEFI - Sequential Electronic Fuel Injection
EGR - Exhaust Gas Recirculation
EVR - Electronic Vacuum Regulator (regulates vacuum to the EGR)
EVP - EGR Valve Position
DPFE - Delta Pressure Feeback EGR
TBI - throttle body injection
ECU / ECM - engine control unit / module
VSS - vehicle speed sensor
MSDS - material safety data sheet
EMA = engine manufacturers association
VI - viscosity index
ABS - antilock brake system
AFR - air fuel ratio
TDC / BDC - top / bottom dead center
DIS - distributorless ignition system
EEC - evaporative emission control
EGO sensor - Exhaust gas oxygen sensor
MPFI - multi point fuel injection

Quote:
Originally Posted by Psychopete View Post
Green is fuel, brown is ECC.

ECC could be out as that opens the circuit for the fuel pump relay (see wiring diagram on autozone or something.) Could also be a fuse link.

Well, back to drinking beer.



Pete
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Old 12-15-2007, 10:41 AM   #8
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Quote:
Originally Posted by greaseyfingers View Post
what's the ECC...
ECC (engine control computer) = PCM or ECM or ECU, etc.

I need to pick one and stick with it .

Pete
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Old 12-15-2007, 07:37 PM   #9
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Default Code 96

well unfortunatley, i have been experiencing the same problem. started with a code 95, which just happend to be a loose connector on the drivers side all by its lonesome self. i cut that bitch out and put in an inline fuse for that problem.NOW a code 96 showed up. with no power to the fuel pump, i was wondering what to test for at the relay connectors. How do i test if its a bad relay. which one should i start with.I know theres two there, but the wiring diagram shows that the eec doesnt run with the fuel pump circuit. im confused, since i have heard and seen on here otherwise.

I have already determined that the issue is past the fusible links, running through the two yellow wires. I have already studied and looked at the wiring diagram for the engine for hours, trying to figure out what to do and where to continue my search...
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Old 12-28-2007, 12:32 AM   #10
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The problem with my B2 ended up being one relay (pcm) and one bad relay connector/wiring harness (fuel pump). The pcm relay was full of water, so I did not bother checking, I just replaced. I would recommend swapping in a spare relay as a fast way to rule out a bad one. When I removed the fuel pump relay, I noticed the terminals inside the harness were corroded. Rather than testing I replaced the harness connector and reinstalled the relay. The B2 fired right up, even with two year old gas. If that all looks good, I suggest checking for power at the inertia switch, the inertia switch itself,power at the pump and finally check the fuel pump itself. Obviously it would be a better idea to grab a manual, locate the wiring diagram and go to town with a test light. Electrical problems can be additionally frustrating if you try and guess your way through it. Good luck.
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