murgocurgo87

Sup guys,

I just installed a turbo in my 87 rx-7, with turbo II fuel injectors and a turbo II ECU, plus other accessories. Everything works, however, I also installed a new Walbro Fuel Pump and I think the fuel pump stopped working.

I came to this conclusion because when I turn the key to the "on" position, the fuel pump does not stop making the whinning noise, it just continues, and the car does not want to turn on anylonger. When I first installed the fuel pump, when the key was in the "on" position the fuel pump would make the noise then stop, and when I attempt to turn the car on, it starts right away. However, now it continues to make the whinning noise on the "on" position, and the car does not turn on, which makes me believe the fuel pump has failed to work like it should.

If any of you have any information regarding this topic I would greatly appreciate it if you can give me some advice.

Thanks,
Muris

Texas_Ace

iTrader: (18)

sounds like either a short or your AFM is stuck as that is what controls the pump.

Try checking that, and make sure the yellow plug that is by the airbox is clean and not shorted.

Plus the fuel pump running all the time should not effect the car starting unless it is flooded.

HAILERS

Let's see. The ignition switch has these positons.LOCK, ACC, ON and START.

Fuel pump should only run when the key is HELD to Start. Or if the engine is actually running and the fuel switch in the afm is pulled aft and *makes*. Or if the key is ON, and the fuel pump check connector is jumpered (puts a gnd on the Circuit Opening Relay much like what the fuel switch in the afm does).

If you go to ON, the pump should not run.

Are your problems, that the car won't START when the key is put to START and also another problem is that the fuel pump runs when the key is to ON????????

I'm slow. I can't quite figure out the problem, unless your using ON in place of the word START.

Texas_Ace

iTrader: (18)

We have an ACC key positon? wow, learn something new everyday, where is that hidden BTW? lol

HAILERS

For those who have not been out to their cars in some time, and have altheimers, I have posted a jpg with a red arrow pointing to the location of the ignition switch that has the ACC position on it.

murgocurgo87

Thanks for the replies.

I tried unflooding the car and after that has been done it wants to start but doesn't. My only concern is why the fuel pump is making that noise when the key is turned to "ON." A couple of days ago, when the car did want to start, the fuel pump begins to make the whining noise when the key is switched to "ON" but it stops and the car is able to start. Now, the sound of the fuel pump is heard continously and the car won't start.

Maybe it's not the fuel pump since it is brand new? But I did hear that it is very possible for a fuel pump to go out really soon.

Any other ideas?

Thanks,

Texas_Ace

iTrader: (18)

LOL, though i have actually yet to drive my car at all, the most it has been driven to date was a trip to radio shack down the street. other wise just around the block and down a long acsess road. I will have to see what is wrong with my switch though, i know i only feel 1 click when turning it then the starter.




As for what to try now, i know i installed a fresh fuel pump in mine and within a week the sock was clogged due to junk on the inside of the tank. I had to swap tanks with my other car it was so bad. Though your problem sounds like a flooding issue, not a no fuel issue.

To test, try taking the intake off, and first check the AFM and see if it is stuck. when it is fully closed the fuel pump should turn off.

Then try spraying some starter fluid/carb cleaner into the intake when starting. If it starts right up then it might indeed be a no fuel problem. If not then you have a too much fuel problem.

If it is a no fuel, then pull the pump and see what it looks like, also get a new fuel filter.

If it is a flooding problem, then pull the lower spark plugs. Crank it a few times with the EFI fuse pulled out (important!). Then put about an oz of motor oil into the spark plug holes. Put plugs back in and try starting again.

When mine was flooding i have to put oil in the plug holes to get it to start. it had no compression due ot the flooding without it. but with it it would start up with a little work.

toplessFC3Sman

iTrader: (1)

If the pump stays on, then its a problem with your circuit-opening relay or the source that switches it. It is right under the dash, mounted right by the pivot of the gas pedal IIRC.

One of the black/white wires running to it is the power supplied to the relay. This should have +12v when the car is in the ON or START positions.
The brown wire running from it is the control wire; grounding this wire turns the relay on, in turn switching the fuel pump on. The brown wire is switched to ground either by the ECU when starting, or by a switch in the AFM that goes to ground if the flapper is pushed open.

Either the brown wire is shorted to ground, the relay is frozen in the on position, or you have a bridge between the black/white wire and the blue wires coming out of the relay. This should get you started on trouble-shooting the fuel pump always being on.

As for the car not starting, you may just be flooding it if you have a leaky injector. Id work on why the fuel pump is always on first, and see if that helps the starting problem.

murgocurgo87

You are right, one of the fuel injectors is leaking. So this will cause the fuel pump to continue running and it will prevent the car from turning on?

I have 4, 550CC fuel injectors. You can see the top two underneath the upper fuel rail and one is def. leaking a little. What's the best way to prevent the fuel injectors from leaking?

Or can I just put in one 450CC fuel injector instead, if I cant fix the leak on the
550CC fuel injector?

The fuel injector did not leak at the first couple of attempt of getting the car started, however, after the fuel pressure regulator was installed, and after I got the fuel pressure regulator about 75% from leaking, now the fuel injector has a leak.

Once again thanks for the help everybody,