EA82 carbie fuel pump control module

GOD · Post by **GOD** » Mon Nov 08, 2010 1:52 pm

Because the EJ22 ECU still refuses to switch the fuel pump, I'm trying to use the original L Series fuel pump control box. It switches on with the ignition, but then cuts off after a few seconds, presumably because it isn't getting an "engine running" signal from the EA82 wiring (which is now all rolled up and tucked away inside a mudguard).

Anyone know what this module uses to work out that the engine is running, and where I can find it? Hoping it's as simple as powering or grounding one wire, or else the car might just develop a fuel leak and a stray spark.

Dane.

Post by **TOONGA** » Mon Nov 08, 2010 2:09 pm

you need to find your fuel pump relay and either bypass it or wire it so it thinks it is getting a constant signal from the engine (distributor)

this might help pin 6 wire colour LB

TOONGA

GOD · Post by **GOD** » Mon Nov 08, 2010 2:30 pm

What book is that page from? It looks like that Pin 6 is the one the EJ ECU is supposed to ground to start the fuel pump, and that's what doesn't work on my car.

Dane.

Post by **TOONGA** » Mon Nov 08, 2010 2:44 pm

it is from the mythical L series FSM that T'subaru owns. I know in my brumby the relay is behind the passenger seat be hind the plastic that hides the shell of the car (if that makes any sense)

the jpeg comes from this thread

showthread.php?t=18159

TOONGA

GOD · Post by **GOD** » Mon Nov 08, 2010 2:48 pm

Yep, I know where the fuel pump relay is (under the dash on my car, up above the driver's side kick panel), the hard part is finding the wire I need to make it see that the engine is running. You mentioned distributor - that's probably what I'm looking for.

Dane.

Post by **TOONGA** » Mon Nov 08, 2010 2:55 pm

I reallise now that the mpfi 89 Lseries ecu is no good for a carby engined car the gregorys manual showthread.php?p=150909#post150909 (if you don't have a hard copy) section 17.2 has the wiring diagrams for the L series carby motor

TOONGA

steptoe · Post by **steptoe** » Mon Nov 08, 2010 5:53 pm

dizzy or coil? We use a coil reading to tell things engine is now running in LPG stuff called a tachometric relay and it is what you could use quite easily and cheaply. They are about $30 or less, provide a primer power supply for starting and will cut out after about three seconds if coil connection does not signal it engine is cranking or running.

Peel instruments in SA have a website a bit like peelinstruments.com.au ?

RSR 555 · Post by **RSR 555** » Mon Nov 08, 2010 9:01 pm

steptoe wrote:dizzy or coil? We use a coil reading to tell things engine is now running in LPG stuff called a tachometric relay and it is what you could use quite easily and cheaply. They are about $30 or less, provide a primer power supply for starting and will cut out after about three seconds if coil connection does not signal it engine is cranking or running.

Peel instruments in SA have a website a bit like peelinstruments.com.au ?

Bingo

Like Jonno says.. it runs off the coil.. when the dizzy starts spinning (and pulsing) the fuel pump relay jumps in.. both Carby and EFI models have the priming circuit (about 5 secs) You'll need to find the wire from the negative side of the coil (also the same for the Tacho) and then grab a negative trigger from your Ignitor

steptoe · Post by **steptoe** » Mon Nov 08, 2010 9:05 pm

Yeah, think the EA82 ECU controls the power to the pump for start up and run. See what happens when you tinker with things...?

GOD · Post by **GOD** » Mon Nov 08, 2010 9:13 pm

Reckon the that's in the car already must be very closely related to a tachometric relay.

Anyhow, I ended up doing a quick and dirty fix with the pumps switched straight off the ignition. Not perfect, but got the car running for the first time in months. Thanks for the tips fellas.

Dane.

RSR 555 · Post by **RSR 555** » Mon Nov 08, 2010 9:13 pm

Just for future reference, others that my read this post. Dane's (GOD) car was originally a Carby EA82 and has swapped the engine for a EJ22 (EFI)

BTW.. how's the top end Dane?

GOD · Post by **GOD** » Mon Nov 08, 2010 9:18 pm

Didn't see those last replies. Thanks Paul, that's exactly what I was after. But I suspect my temporary fix is going to remain there for some time - just drove the Subie out of the garage to make room for the "good" car that now needs work

Dane.

RSR 555 · Post by **RSR 555** » Mon Nov 08, 2010 9:21 pm

No probs bud.. pics of the "good" car.. better be a Suby

GOD · Post by **GOD** » Mon Nov 08, 2010 9:33 pm

RSR 555 wrote:Just for future reference, others that my read this post. Dane's (GOD) car was originally a Carby EA82 and has swapped the engine for a EJ22 (EFI)

Yeah, what he said.

BTW.. how's the top end Dane?

Yeah pretty good. Lots of places to explore. It's tough on cars though - seven flat tyres in less than six months, and assorted minor damage.

Dane.

GOD · Post by **GOD** » Mon Nov 08, 2010 9:36 pm

RSR 555 wrote:No probs bud.. pics of the "good" car.. better be a Suby

Ummm... it's white, it's Jap, it's four wheel drive, it has four cylinders and a turbo, and it's hard to get parts for up here. So it's just like a Subie

Dane.

RSR 555 · Post by **RSR 555** » Mon Nov 08, 2010 10:25 pm

GOD wrote:Ummm... it's white, it's Jap, it's four wheel drive, it has four cylinders and a turbo, and it's hard to get parts for up here. So it's just like a Subie

Dane.

As long as it's Toyota and Diesel then I'll forgive you

Post by **TOONGA** » Mon Nov 08, 2010 11:01 pm

glad to see you got it working Dane even if it is jury rigged to the ignition:)

TOONGA