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Old 05-09-2012, 02:15 AM   #1
em1bugeye
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Default fuel pump wont prime, car wont start.

question....fuel pump wont prime. just checked the relay (it clicks), changed out the fuel pump to another unit that works for sure.....still nothing, checked the ignition fuse inside the car....still good. Im guessing its multimeter time, but the car doesnt prime. it primed a few days ago before i put my turbo kit on and deleted the cruise control, but after that, no priming what so ever. I just found out that the sbf-5 (30amp fuse) blew and I replaced it with another fuse and it blew again right as i went to prime the motor. I still wanna check to see if the relay clicks because its pretty quiet down there but im pretty sure I heard it click the last time. is there any possible way that the fuel pump controller could be the issue. I also have to check to see if the ignition fuse could have blown as well when I primed the engine the last time. I have a short somewhere, but I don't know where. any ideas? thanks.
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Old 05-09-2012, 02:36 AM   #2
Tylenol Jones
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This happened to my friend once when we were at the top of a mountain. There is a solenoid somewhere that likes to get stuck sometimes. We had no idea until our other friend told us. We banged somewhere along the gas tank and the pump started to prime. I don't know if this is your problem, but I would look for that solenoid.
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Old 05-09-2012, 02:41 AM   #3
em1bugeye
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WHAT? banged on the gas tank? as in banged on the trunk and it began to prime?
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Old 05-09-2012, 02:59 AM   #4
em1bugeye
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does anyone happen to know the location of the fuel pump controller?
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Old 05-09-2012, 03:13 AM   #5
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Fuel pump controller took a crap, replace it.... $60 for a new one and youre good to go.

Its in the trunk, behind the passenger (right) side trunk trim. Pull it back its bolted to the side of the car just before the tail light. Its pretty small and has a bracket attached to it. Its about 4inx5in. Replace it, and be back in business.
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Old 05-09-2012, 04:44 AM   #6
em1bugeye
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Quote:
Originally Posted by UK-Wagon View Post
Fuel pump controller took a crap, replace it.... $60 for a new one and youre good to go.

Its in the trunk, behind the passenger (right) side trunk trim. Pull it back its bolted to the side of the car just before the tail light. Its pretty small and has a bracket attached to it. Its about 4inx5in. Replace it, and be back in business.
ok. well i tested the relay...has power(it vibrates and clicks), tested the fuse, has power( and it blew again ), tested the connector that connects to the fuel pump hanger...it gets power too. so im going to assume something really random....the battery. after i charged the battery with this portable charger, it blew the fuse. . .doesnt make any sense, but im going to take it out and have it tested. because the only thing that is blowing is the fuse. if the connector that connects to the fuel pump gets power, im assuming the controller is getting power as well because there would be a short somewhere within that general area and the connector that snaps into the hanger wouldnt be receiving any power.
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Old 05-09-2012, 04:53 AM   #7
em1bugeye
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i think i may have overcharged a cell in the battery so now its putting out too much amperage. blowing the fuse immediately?
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Old 05-09-2012, 11:21 AM   #8
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Quote:
Originally Posted by em1bugeye View Post
i think i may have overcharged a cell in the battery so now its putting out too much amperage. blowing the fuse immediately?
Not likely. Just because you have a large supply doesn't necessarily mean the circuit will draw too much current. It's possible, but I doubt it. You have a short, or a high current draw from some component on that circuit. You will have to search to diagnose it. Electrical repairs are not easy.

And what do you mean by prime? Do you mean it will not build pressure? Or do you mean the pump will not turn on at all?
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Old 05-09-2012, 12:50 PM   #9
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the pump wont turn on at all. all the components that lead up to the pump have power which lead me to believe it was the battery. if i overcharged a cell in the battery, it could carry to much amperage which still carries a lot of voltage so maybe it discharges too quickly, blowing the fuse. i dunno, im going to have it tested anyways. whats the worse that could happen ya know?
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Old 05-09-2012, 04:16 PM   #10
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swap in a good FPC from a buddys car..... humor me with what happens.
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Old 05-09-2012, 04:47 PM   #11
em1bugeye
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Quote:
Originally Posted by UK-Wagon View Post
swap in a good FPC from a buddys car..... humor me with what happens.
yea I should probably do that. I was probably being delousional to think my BATTERY caused the problem :/ but i will swap anothr fuel pump controller from another wrx and see what happens. GAWD IF I POP ANOTHER DAMN FUSE AGAIN, HEADS WILL ROLL!!! @5bucks a pop, this is gonna get pricey :/
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Old 05-09-2012, 11:16 PM   #12
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its not the fuel pump controller either. i just replaced the unit from my friends car and it still popped a fuse :/ NEXT!!! im about to just take off the downpipe, o2 sensors and the maf and see if the car primes. maybe one of these connections was grounding something out in the wiring and blowing the fuse. i dont know how but thats my last option at this point. im jus saying that, because before i put them on, the car would prime, and afterwords, it would pop fuses.
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Old 05-10-2012, 01:02 AM   #13
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What led to this problem. Did it just happen out of no where one day, or did you install anything? touch anything then didnt prime anymore? I feel like were missing a piece of the puzzle now.
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Old 05-10-2012, 01:16 AM   #14
em1bugeye
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like I said at the beginning of the thread. I put on my downpipe, front, rear wideband o2 sensor and maf sensor. after that...no prime. which leads me to believe NOOOWWW that maybe one of them grounded themselves out to something, or there's a break in the wiring somewhere in one of the units. so im going to disconnect all the sensors, and put another fuse in and see if it works. if it does, then im going to connect each sensor 1 by 1 to see which one is grounding itself out causing the fuse to blow. thats if what im saying right now is the actual issue.
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Old 05-10-2012, 04:05 PM   #15
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yea....nvm that wasnt it either. I guess I just need to use the volt meter and find where the break in the wiring is and go from there. this is frustrating. :/
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Old 05-10-2012, 04:12 PM   #16
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My best guess is a short to ground somewhere in the circuit that contains that 30AMP fuse.

Good luck. I suggest you take your car to an experienced technician!
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Old 05-10-2012, 09:38 PM   #17
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Get a skematic for that circut, and find whats grounding out. Are you running any of those sensors off that circut?
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Old 05-10-2012, 11:12 PM   #18
em1bugeye
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Im running nothing off them. According to the electrical diagram, the sbf#5 fuse runs off the battery, then the fuel pump relay runs directly off of that. Then from there, the fuel pump controller runs directly from that to power the fuel pump. But the problem is, I tested the fuel pump controller 6pin connector and it has no continuity. There's no power and the relay pin has 4 pins. 2 pins are for power I'm assuming, and 2 are for something else. When I tested the 4 pins, only 1 pin of the 4 lit up. I just need to figure out why the second pin isn't lighting up or where the short is coming from. My guess is that the short is right Aftwr the fuel pump relay and before the fuel pump controller. But I won't know that until Sunday when I get back to the car to test all the power wires. I also need to find out what colors are the power wires and what color are the ground wires :/
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Old 05-22-2012, 12:08 AM   #19
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im having the same problem. With our power combined we can fix this.... or captain planet might appear. ONe of the two and both would be sweet
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Old 05-22-2012, 12:29 AM   #20
PSBeachBum
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well come to find my sbf 5 fuse was blown and i replaced and it started. No problems. So somewhere you( and maybe I) have a ground
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Old 05-22-2012, 01:24 AM   #21
em1bugeye
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ok, so i got the fuel pump to prime by making a switch and running it to the battery with a relay. it worked great, the fuel pump primes like a BAUS. but now i have no spark and my injectors do not pulse...any ideas people? ECU? hmmmmmmmmmmmmmmmm...maybe part of the ecu took a dump? I DONT KNOW! the brown plug that connects to the ecu harness to the engine wire harness is plugged in.
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Old 05-22-2012, 08:32 PM   #22
em1bugeye
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yea i have no clue at this point. i installed another ecu from an 03. it had a rom for diffrent injectors but i still cannot create any exhaust pressure or any spark. im stuck
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Old 05-23-2012, 09:51 AM   #23
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Do you have any codes? I'm out of ideas, but if it were me, I would start with the ECU, and see what it thinks is going on. If it thinks everything is fine, then you might have wiring issues. Got a buddy that knows cars? Sometimes it's better to have a fresh set of eyes on the problem.

If not, it might be time to suck it up and take it to a professional.
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Old 05-23-2012, 01:18 PM   #24
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So I am back in the fray. I drive 50 miles on the new fuse. Then it blew and so did 3 backups. I havent had the time to search but I am pretty much concluding that mine is grounding out somewhere near the electrical connector to the fuel tank. I removed the pump and all that and I assume that wiggled the wire enough to get the ground off whatever its touching. Over time it re grounded so thats my area I am starting.
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Old 05-23-2012, 02:52 PM   #25
em1bugeye
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well i dont think its the ecu, because the HUD lights turn on, which is essentially the ECU test. and codes? if i could start the car, then i would have codes!? since I cant do that, im back to square 1. im taking out the engine wire harness today and replacing it with another one to see if that maybe it :/ bahhh. i hate electrical issues. its grounding out somewhere.
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