Resolved fuel pump wiring diagram?

[0fg]

I think I am having fuel problems. Car flashed cel the other day, and it stumbled. My guess is crud getting into the fuel filter, plugging it up, killing the car,, then after it sits a while, the crud has fallen back to the fuel line, and it starts again,, just my guess though.


So, what I want to do before installing a new filter, is run the pump, and see if a bunch of crud is expelled from the line. I do not want to just crank the engine a bunch.


Yes I searched! I think there is a "plug" somewhere near the battery that can be used to hotwire the pump??

Ya know, if people would make the title of their posts relevant to the topic,, and not just " strange problem" or anything irrelevant,, it would be easier to find stuff in the search. Just my 2 cents.....

Ran perfectly till it recently started cutting out just a little bit. It was acting like the air conditioner compressor was cycling in and out. Just a little hiccup in the running every now and then. Never was a problem till it stumbled and flashed cel the other night.

Have not run the car sinse then. I am waiting to purge the tank before installing a new filter.

Thanks!

 

[akira235]

my suggestion would be to use the mpi relay, its next to the ecu.

in order to make the pump flow you need to remove the metal cover and expose the two tabs underneath, one of them (i think the one on the right) will make the pump flow if you simply press it down

 

[luv2rallye]

On the 91-94 there is a fuel pump check connector (with 1 black-white wire) on the firewall (near battery?) by itself. I assume the 90 has it too. Just connect +12v there to run the FP (go through a 10A fuse to be safe).

 

[NOSLO2PT0]

The 90 has this terminal as well.

 

[0fg]

Thanks! So, I ran the pump for a short bit,, no crud came out,, so I went ahead and installed the new filter. It seems to start and run fine. I just took it for a short drive.

Now, when it flashed cel, I remember the coolant temp gauge resting right in the middle, which seems odd because it was at night in slightly cooler air.

Todays test drive was in 98+ degree air, and the cooling fan did kick on, but the temp gauge didnt quite get to midway, stayed just shy of midway.

Idle seems fine at around 800-850 rpm, smooth. Havent done plugs and wires yet,, just fuel filter.