just a little bit of help please(fuel pump)

[nonnel]

hey,

here's my problem im wiring up my silver top but i just dont understand how to wire up the fuel pump?

im using the 20v silver top wiring loom and the wires that go to the back of the car are what im matching with the rest of the car,

so far i matched up the brakes,reverse,parkers, etc..
im just stuck on the fuel pump.

i have 2 wires that turn on when the ignition is on, one is a red wire with a blue strip, or i have a blue.

when i connect ether two, too the power of the fuel pump and turn my car ignition on, it pumps but doesn't stop pumping and i end up flooding my engine?

any help would be appreciated

[AL510]

Hi Mate, I dont have experience with your exact setup but with other efi setups you dont get power to your fuel pump until you crank your engine. Having said that you could run it from power from ignition on and it wont flood your engine as the injectors dont open until you crank it. The fuel just returns to the tank.But if you hook it up this way and you had a prang and could not turn off the ignition the pump would continue to run which could have disasterous effects if you have a ruptured fuel line.

Cheers, Al.

[nonnel]

thanks AL510

so i found a blue with a black strip wire that turns on when the car is turning over.
ive plugged that wire to the fuel pump.
and i managed too start it once but after a little while it turned off ...
??
and it wont start unless i un-plug the fuel pump.
then it runs out of fuel and turns off.
i plug the fuel pump back onto that wire and it starts then stops after a while?

i have 5 wires coming from the fuel tank im gathering 3 are for the gauge, 1 power, 1 earth?

[AL510]

If you run your pump from the constant power does the motor still cut out after a few seconds of running?the blue wire with the black stripe that only gives you power when you crank does it still give you power when you stop cranking and the motor is running?

[nonnel]

yep it cuts out if it has constant, then i have to run it dry,
but if i get it started the blue with black wire still has power when the car is running..

[AL510]

well it doesn't sound like a power supply problem.the motor should not flood because your pump is running.the pump runs all the time when it is going.
If you think the motor is flooding it can realy be only a couple of things.either your injectors are sticking open-unlikely, or you have too much fuel pressure-most likely.this can be from either a sticking fuel pressur regulator which is very likely or you have not plumbed the fuel line correctly.your fuel line should come from your pump to your fuel rail then through the regulator and return to the tank.the best way to check is to put a fuel pressure guage between the fuel rail and the reg and this will tell you the fuel pressure your injectors are seeing.

Cheers, Al.

[MWP]

Hi Mate, I dont have experience with your exact setup but with other efi setups you dont get power to your fuel pump until you crank your engine.

Err, what?
Most ECUs turn the fuel pump on for a second or two when the ignition is turned on to prime (get the lines up to pressure) the fuel system.
The ECU then turns on the pump constantly when the engine is turning over / running.
It has nothing to do with cranking.

Having the fuel pump running all the time is not a problem either... it will not flood the engine (the injectors are closed so no fuel can enter the engine).
The ECU controls the fuel pump for saftey reasons only.
If the saftey reasons were not a concern, there would be no problem with running the pump from ignition power.

[AL510]

If you read it all you will see every thing you have said is covered already apart from the 1-2 sec priming time on the pump. but I believe he will not have continuos power to the pump until the motor is turning over/ running on the correct curcuit.
I am just trying to give the bloke a few ideas as to what his probs may be based on my experience.
We have already worked out his pump is running and does not appear to be the cause of the prob which I have given a couple of possible alternatives as to why it may be fueling up then stalling.
If you have any other suggestions feel free to help out

Cheers, Al.

[CrUZida]

Err, what?
Most ECUs turn the fuel pump on for a second or two when the ignition is turned on to prime (get the lines up to pressure) the fuel system.
The ECU then turns on the pump constantly when the engine is turning over / running.
It has nothing to do with cranking.

All the Toyota ecu's I've played with only run the pump when in START or when the ecu senses the motor is running. They don't prime when ignition is first turned on.

My experience is limited to 6's and 8's though, no 4's.

[CrUZida]

btw, if an engine stalls from over fueling, generally it will be a prick to restart straight away.
So if you are finding that you can restart the engine almost straight away, with no major hassle, then its unlikely that overfuelling/flooding is the cause.

[nonnel]

hey sorry work got it the way...
you know how it is..
it doesnt start straight away i have to crank it a few times with the throttle to the floor and the pump off to get rid of the build up of fuel...

CrUZida and MWP its a AE101 silvertop 20v ecu with ae101 silvertop wiring loom, its a pump from a 4afe ae92.
i read a ECU wiring diagram last night and the blue wire with a black strip is the one it say goes too the pump.

my silvertop has been sitting around for a good 6 months and i believe its just the fuel pressure regulator i just got home from work so im going out to clean it now, i forgot a pressure reader but it do one diagnostic at a time.

thanks for the replies

[nonnel]

ok so i took the regulator off, basic just looked at it to see if i could find any obstructions, there was nothing i put it back in.

started my car up and it, started ran for about 5 seconds at around 800rpm then stalled.
tried to start it back up but wouldn't.
so i un-plugged the pump started it up and just stopped it when i know its going to turn over but run out of fuel?

is there anyway to see if air is getting blocked at all?

[AL510]

Once the motor is running for a few seconds you should not have air in the fuel line as it returns to the tank in a big circuit so it should bleed it self.do you have a return line to the tank from the reg?if this is set up correctly the only way to check for correct fuel pressure is with a guage inline.I have had a reg fail on me and it gave full pump pressure, which was over 100psi on my guage which was as high as the guage read and it was enough to stop the injectors opening at all.If you think your engine is flooding this is a good place to start.
After the engine stops will it restart with out disconnecting the pump?

Cheers, Al.

[nonnel]

hey al,

i was going over some things and i removed the charcoal canister and now that its by-passed it runs..

only problem is..
when its going it just revs slowly higher and higher, if i give the throttle a kick it revs up then sits alittle lower than how high the needle got..

so the problem was with my vacuum's
i now need to find a descent picture so i can redo my vacuum lines.

thanks al