Could a car sitting in for 3 weeks (battery removed) have negatively affected the fuel pump in some way? Black car + 40 degree weather…
It’s a walbro pump that worked perfectly fine before I left, on a stock KA. Battery has plenty of charge (cranks hard, lights at full brightness)…
I did take the fuel pump fuse out before I left (in retrospect I guess it was kind of pointless to do that)… possibly I could have risked screwing something up? (dont’ see how though) I don’t know why it wouldn’t work as before after putting the fuse back in.
If you took the fuse out, the connectiosn where the fuse goes could have
corroded or something.
Clean them out and put some dilectric (sp?) grease on the fuse, then pop
it back in.
If it still doesn’t work check that the fuel pump side of the fuel pump relay
is getting power.
My S13 had some issue with its fuel pump relay that I never figured out, it
was just whack, so i bypassed the relay and wired the fuel pump to come
on with the key.
The fuse terminals aren’t corroded, but I put a bit of some dielectric in there for good measure.
Although I’m not 100% sure, I am -pretty- sure I can’t hear the relay(s) clicking for the fuel pump.
Is the fuel pump relay the one marked EGI PUMP in the passenger side relay box? There are two green relays beside each other, one marked egi pump the other marked egi…
What is this mysterious EGI? Either the relays got boinked (is this typical for a car that’s been sitting?) or they are not being energized, which means, i THINK, that the wiring from the ignition to the relay is fux0rd.
Step 1 is to find some relays… i’ll update what happens.
Turns out the ecu wasn’t sending out a ground signal to the relay. I have no idea why this was. Any thoughts anybody?
So I ended up having a friend manually prime the pump by hotwiring it direct to the battery, while cranking the car at the same time to build fuel pressure. After that, for god knows what reason, the ecu just started sending a ground signal on its own.
So now the car starts. Is there a fuel pressure sensor anywhere or ANY kind of sensor that the ecu checks before sending a ground to the relay?
What’s the deal with this ground signal from the ecu. I think part of the reason is because it times it for priming (for the 4 seconds); someone also told me it’s a pulsed ground… what’s that mean exactly and how does it work?
Did you leave the batt connected that whole time?
Next time disconnect it.
ECUs do funny things when you leave them sitting with power and start disconnecting/reconnecting stuff…
Might of just settled and maybe clogged? I don’t know it might be a long shot but if nothing else is working then what I’ve seen work before. Is take a rubber mallet and just give it a nice rapping to unjam anything stuck in the lines. Just a suggestion.