Zeus

iTrader: (66)

Twice now I've had the car "die" after prolonged cruising at 70-80mph. After waiting a few minutes, it starts right back up as if nothing were wrong, and runs fine. I don't recall if I heard the pump cycle or not at the time (it was 3:30am and much too late for this old man to function). It is an old pump that has seen 90-100psi while serving a SC GSR with a boost dependent regulator... so I'm ordering a new pump this morning. I have seen a similar problem in the Honda camp, but that was a long time ago. However, I'd like to know if anyone has "wore out" a Walbro in an Evo yet. I don't like "unanswered questions" even if I find a solution.

Noize

iTrader: (24)

Does it sputter and die or just die instantly, like the tach drops from 4000rpm to zero and the car stalls? If the latter, I'd suspect an ignition problem.

Zeus

iTrader: (66)

It cuts out like when a Walbro over heats... like I said... wait a minute or two after it dies, and it will crank right up like nothing ever happened. I'm pretty sure I didn't hear the pump prime either.

evo81

iTrader: (30)

never have this problem with the walbro

EVOla_VIRUS

iTrader: (16)

The fuel itself cools the motor...are you using the over-voltage method of increasing flow? If not, check, via mutimeter, that the normal ~12V is being supplied. If it isnt, check the electrical connect back to see if anything is out of the ordinary. Good Luck.

JustDSM

iTrader: (28)

Interesting. I took mine on a non-stop drive to and from Wyoming-Texas (1150 miles) and never experienced such a thing. That trip included a few good 4th gear pulls and lots of 90-95mph cruising.

naucrx

iTrader: (19)

Non stop? How'd u get 1150 miles on one tank of gas?

I just took my EVO on a Phoenix-Denver trip and stopped only for gas and never had a problem with my Walbro pump going wacko. I just installed it the night before I went on my drive.

WHTEVO

iTrader: (18)

never had a problem with any walbro pump either. used it in my 2g eclipse, also currently have it in a couple of my talons, and now my evo.

Zeus

iTrader: (66)

Well, switched out the pump... no good. I'm thinking a relay is dead somewhere. I just don't hear the pump prime when I turn the ignition to the "on position".

timzcat

iTrader: (10)

Relay is very possible, there are 2 fuel pump relays in the junction block and they run through each other so both are needed to energize the pump. The hotter they get the more likely they will kick out and disconnect the circuit. Most relays are the same so if you can find 2 on the car to swap with you can test.

Zeus

iTrader: (66)

Pump is good, coils are good, I'm working my way around the obvious. The plugs are "dry" with no fuel smell after turning it over...

timzcat, thanks... I was headed there next. I had checked fuses earlier, but not the relays.

superz

iTrader: (7)

BY the way, the Evo fuel pump only primes when cranking, not with the key on like most other cars.

Like someone else asked, did the car just fall flat on its face or did it start to sputter then slowly cut off? If it was sudden then it could be an ignition concern. A bad or weak FP will slowly come to a stall. You may also want to check the injector harness and ECU harness, a bad connection will cause a loss of signal to the injectors or coils. Did you recently have any part of the engine apart? Like a the head?

SwiftEVO

iTrader: (32)

^^^ Yea it doesnt prime until you turn the key to start it.


--Josh

Zeus

iTrader: (66)

Another pump was swapped in... resistance on the coils is good. There is spark at the plugs while cranking. I pulled the fuel return line and cranked it over... no fuel spurting everywhere (in a bottle)... zero. Started checking relays. The #1 #2 under the dash were fine. Pulled the #3 off the fire wall and had no continuity between #1 & #2 pin (if I'm holding the damn relay in the correct position) as there should be per service manual 13A-768. Pin #3 & #4 had continuity as they should. I think I found my culprit.

Thanks to everyone who posted... until I get another #3 relay on the car, I still consider this matter open as my new relay will not get here until Monday. I'm going to try to borrow one before then just to "make sure that is the issue".

SwiftEVO

iTrader: (32)

Be sure and let us know how it goes.

--Josh