Fuel Pump Install Help Options

[turbohcar]

-6 Stainless braided!

From www.slowboyracing.com
or you can piece together your own kit cheaper than that, I just didn't have the time to do all the runaround work.

[turbohcar]

Here's the latest and greatest problem with the Talon now. I put the new IC piping on and it looks fantastic. I put the new fuel pump in and soldered all connections, did the pump rewire and all appeared to be fine. I performed it exactly as the vfaq said. I turned the car to the ON position without the fuel line hooked up in order to do a test run. Nothing happened. So, I got out the lead tester and started checking connections. The power wire is getting power but the old fuel pump power wire (which is used as a signal wire on the relay) is not. I actually jumped the two wires just to make sure that the pump was working and it kicked on and spit some fuel out. So, now I'm left wondering why the stock fuel pump power wire is not getting any power. MPI fuses/relays all look good and I've checked the stuff I could get to right away. I didn't have a whole lot of time to go over it late last night but I would like some ideas on where to start looking first. Thanks!

BTW, everything ran when it was parked in the garage so it should all be operational.

[mitsu90]

on the galant, it did the same thing truned the key on and the pump did not prime, but the car runs just fine.

[turbohcar]

So the pump only runs when the car is running? That's strange, I thought all things that are on when the car is running should be on when the key is in the ON position.

[mitsu90]

thats what I thought. but mine dosn't purge when I turn the key on. if I use the logger to purge it without the motor running it turns on.

[Mitsu 77]

The pump won't run untill the ecu sees a crank pulse. Hook it all back up and crank the motor over and I bet the pump will start to run.

[turbohcar]

Wonderful. Thanks guys!

Things should be wrapped up for a test drive today.

EDIT: I guess I was thinking of a GM product that requires a couple key cycles for the fuel pressure to come up, therefore the pump had to be on when the key is on in order to build fuel pressure. Who knew GM and Mitsubishi were so different?

[turbohcar]

Well, lets just say things turned out to be not-so wonderful. I hooked everything up. Couplers, clamps, fuel line, so on and so forth. It appeared that the AFPR was preset to 40psi, as that was the reading on the gauge when I cranked the engine over. However, while cranking it did not start or sound like it was about to. I thought maybe it could be too much fuel, lowered the AFPR setting and tried again. No dice, and this time when I got out to check the gauge it was sitting at 0. To be honest, by this time of night I was fed up with messing with it and decided to go inside and get something to eat. I didn't even start diagnosis yet so I have no idea what it's doing, just decided to update. I'll have further details by tomorrow.

[turbohcar]

OK, I've gone a little further in depth into diagnosis and have come to one conclusion. The fuel injectors are not firing. I have spark, I have fuel pressure, but no fuel in the cylinders. It doesn't even look like the tops of the cylinders are moist. I can't even hear the injectors prime the cylinders when I turn the key on like the stock injectors do.

A little background:

NGK BPR7ES plugs
Accel Wires
780cc disk style injectors
FIC injector seals
Full Throttle AFPR w/ Autometer FP gauge
Eprom ECU chipped by Wort for the injectors among other things
Walbro 255lph HP pump rewired

Any and all suggestions/diagnosis tips are welcome. Thanks!

[AWD DSM 1]

fuses all good?

[turbohcar]

As far as I can tell. Is there a seperate fuse for the injectors themselves though? 'Cause the fuel pump is working.

[BudmannG]

What about that relay under the dash by the ecu? I think it has something to do with the injectors.

[turbohcar]

I have no idea Bud. I think I'm going to try a non-eprom ECU and see if it will just make the injectors prime. That should give me an indication if it's ECU related. In any case the ECU has a 1yr warranty on it through Keydiver so I should be covered.

[turbohcar]

Well, it's not the ECU. After trying the Eprom with the mod chip, the Eprom with the stock chip, and the Non Eprom, none of them make the injectors prime so.... I'm looking for something in between the injectors and the ECU that would create a break in the circuit. Any other suggestions? And what is this injector relay box that Bud is talking about?

[AWD DSM 1]

It's the MPI relay, located on the passenger side down by the ECU, little gold box. I'd also check the injector reistor pack, silver box on the firewall.

[turbohcar]

Too bad I don't have any replacement MPI relays. I might have an injector resistor pack though.... I'll go check.

[mitsu90]

if an auto MPI relay is the same as a 5 speed. I have one.

[mitsu90]

also did you check the MPI fuse?

[turbohcar]

MPI fuse is OK, no breaks in the fuse.
Injector resistor pack is fine, I replaced it with a known good one and nothing happened.
I retested with Eprom and non Eprom ECUs in all forms and none worked.

One thing I did try is to pour a small amount of raw gasoline directly into the cylinders (less than a teaspoon) and it sounded like it fired twice so that's a plus.

Sounds like an MPI relay as it's my last resort.

Mitsu90, PM me your address and what you want for the relay. Thanks!

[BudmannG]

It's the MPI relay, located on the passenger side down by the ECU, little gold box. I'd also check the injector reistor pack, silver box on the firewall.

Thank you Rob for getting that answer. I had alot going on today with car also! But yes Bret that was what I was talking about.