4g63awd

Yesterday I went to start my car and it just spun over so after troubleshooting I found that the fuel pump wasnt working. So I jumpered the power wire from the pump directly to the battery and the car started up and ran fine. I checked the fuel pump fuse and relay in the engine bay and they are both good but unless I have the pump hooked up directly to that battery the car wont start
Is there anything else that I can check that maybe went out? Im at a loss right now.

dannobre

iTrader: (3)

Check the resistor wiring...near the passenger side shock tower........ At the air pump

Then you can start tracing the wires

4g63awd

Ill give that a look but im thinking that its gotta be something simple because before this it ran fine. Is there a fuel cutoff in this car like there is in most domestic vehicles? Or maybe another fuse that ties into the fuel pump?

dannobre

iTrader: (3)

FIrst thing to do is always check all the fuses

I'll pull out the schematic in the AM and see if there is anything I can suggest

4g63awd

the resistor is the plug behind the air pump with a white and blue/red wire coming out of it right?

I tested power at the fuses and relays and the fuel relay doesnt seem like its getting power. Im gonna swap another one into it to be sure

edit - I checked the resistor. It is reading 1.0 ohms (should be .34 right?). Does that mean that it needs to be replaced? And with a higher resistance would it prevent the car from starting or the fuel pump from even turning on?

4g63awd

This morning I read out each relay, both sides of the resistor and the fuel pump. They were all getting power. But after I hooked everything back up I heard the fuel pump prime so I started the car. It started fine but was really weak, wouldnt rev past 4k and was struggling to get there. I let it run up to temp, shut it off started it, let it idle for a few minutes and repeated this about four times without incident. Then I went to start it again and the problem was back, no fuel but power to everything. While it was running I also got codes P0443, P0131, P0031, P0037, P2259, P0661. None of the codes showed up before this fuel problem.
So maybe the ECU is bad? Any help would be appreciated. Im about to burn this car to the ground.

TheWillofDeath

If you havent tried checking your fuel pump or anything and haven't moved anything around this probably wouldn't apply but Id figure Id throw my 2 cents in.

Make sure the black tube connected to the top of the fuel pump doesn't have a bend or crease of any sort.

I had replaced my fuel pump to the walbro one, and while reassembling I wasn't paying attention and put everything back together but had moved the fuel tube more towards the right and reconnected it. So my car wouldn't turn on until I noticed the tube and re-positioned it.

Bonesy

Hi i have a problem with no power for the fuel pump at the fuse box? The pump itself has 11.7volts going to it BUT testing the fuse hole (not a correct term i know) Comes back with 0.00 volts.I have a friend thats an auto electrician (and a bloody good one) but he is away for the bank holiday weekend and i would like to drive it tomorrow! I see someone mentioned hooking it to battery,How can i hook it up to the battery to test?

RotaryTherapy

iTrader: (1)

My resistor reads 0.4 ohms and the fuel pump plug reads the 12volts but not the 3.2-5V at the B terminal ( lower right hand one with the lock facing up ). Car won't start, and died just suddenly during highway speed. Cranks but no start. Fuel pump primes, but doesn't make the high pitched noise or change noise when cranking.

Ahasbu27

Having the same problem, how did you fix yours?

dizcobeat

so what fixed this problem. im having same isusues.

Ahasbu27

replaced the fuel pump

dizcobeat

Yeah i already did that new pump install pump stil not starting.

StealthTL

iTrader: (1)

I'm sure you've checked the 20A 'Fuel pump' fuse, but there are three others that can shut down the pump -
EGI 1 10A
EGI 2 10A
INJ 15A

Check 'em all....

dizcobeat

i will re check all my fuses. i bought new relays , starter, plugs . now there is either a grounding or short in the wiring , i fixed the pin connection in the fuse box fuel relay.. it seemed that was the issue but then it wasnt i was gonna test the resistor but one is on its way. i want to temporarly wire battery to pump..til i can fix all this . is that a decent idea?

dannobre

iTrader: (3)

There is a jumper in the fuse box for the pump . it should turn on the pump if the wiring is OK...

dizcobeat

ok it was getting crazy but i checked the wiring from the pcm and it was throwing a signal and i did a reading on the resistor 1.0 ohm finally i couldnt take it so i called these guys who did a full electrical scan on the whole car. I need a new ECU. and I kind of thoght that. so will keep posted when it comes in if this works...there really cool and will flash it for me and program my spare fob key....if this all works it will be worth the 120.00

dizcobeat

well that was a waste of time and money. thank you dannobre. I should have followed your lead. now im in a different situation. my battery drains like overnight and when i start the car it has a very weak and strained crank but what i noticed was the fuel pump and engine fan run even when its shut off for about 10 seconds i can still hear the fuel pump whirring and engine fan going. I am now charging battery and going to do a parasitic draw, ground test hopefully that will get me a little better to ask what i can do next. right now battery is charging. thank you

dannobre

iTrader: (3)

Sounds like a wiring issue on the fuel pump relay maybe? Are you sure when it was repaired that it is done properly? If the relay is wired so the coil is energized all the time it will draw quite a bit of current.

If you do a current test and pull fuses you should see where the draws exist.

The only thing that should draw current with the key off is the immobilizer circuit and the ECU... and it shouldn't be very large...

dizcobeat

im not sure it was done properly. I am watching youtube vids on parasitic draws and how to find it. so am i on the right track in pulling fuses once i have the negative battery and harness wired between the meter? I know we did a pull on the relay and it started up when he had pulled the relay i believe and had a probe inserted. im sorry im being so unsure. I am gonna be doing all of this on my own. so im trying to find the right starting point. thank you

dizcobeat

so you think i should do a fuel pump relay test 1st? I will look up on how to do that. cause all of this again rose up recently after doing dumb things like changing ecu and such. I went back to original ecu and had it keyed correct per your advice seems like im a little more focused and i know it has something to do with a short a ground .

dannobre

iTrader: (3)

Basically that's the way it works. Don't turn on any circuits or you may overload the meter. Some multimeters don't do too many DC amps... you shouldn't need to worry though unless you have a pretty big problem. If you pull the root fuses and find something you can narrow down the smaller branches after that.... instead of pulling them from the other end of the tree one at a time.

And I'd start with the fuel pump circuit first...

dizcobeat

thank you. as soon as some of this snow clears i will do that. I did a battery neg to harness and i definatly have a large amp 10.47 thats alot. thats why my battery was getting drained. but im gonna do as you suggested above. thank you.

dannobre

iTrader: (3)

That's huge. Make sure you disconnect the battery until.you start the testing... thats a lot of heat going somewhere

dizcobeat

i will and i will make sure that all my doors and and everything is off before i start to pull. Question i cannot find anything on where the major GROUND points are on the vehicle. 2005 rx8 A/T