About Fuel Pumps - Toyota Nation Forum : Toyota Car and Truck Forums

JetspeedCamry · 09-28-2005, 11:08 PM

If the fuel pump stopped working while the car is running, would that cause a lean condition? What sorta problem would arise from having the fuel pump cut out while the engine is running, apart from the engine stalling of course

.

Thanks

ag6286 · 09-28-2005, 11:40 PM

besides ur engine not being able to continue running or start again until replacement....none that i could even remotely think of that could cause damage to the feul system or any other

funny that u say that tho cuz my roomate just has his fuel pump go out on him on teh highway from virginia back to school here in WV....his GF ended up driving him back here and his car was left in VA......sux for him....he just picked it up this previous weekend and runs perfect again....minus the fact his transmission is ready to blow up...

but thats an entire diff. story in itself

do u mean cause a lean condition for a bit previous to it actually stopping to work at all?

***zoni*** · 09-29-2005, 12:08 AM

it would just stop pretty much instantly..

JetspeedCamry · 10-02-2005, 06:39 AM

Yeah i mean, if one of the wires (say the power wire) is cut while the engine is idling, will the car just die immediately, or will it cause damage to the engine, as the amount of fuel leans out.

Fever · 10-02-2005, 07:41 AM

If fuel pump stops, the engine stops. Shouldn't be any run out or collateral damage.

JetspeedCamry · 10-02-2005, 07:58 AM

Good.
If you were to contemplate "disabling" the fuel pump, would it be best to cut the "relay trigger" wire, or cut the actual "fuel pump power" wire...and having that switched via a ... switch

noofa · 10-02-2005, 08:16 AM

So its pretty much a kill switch your after?

JetspeedCamry · 10-02-2005, 08:18 AM

^ Is not my question....

Looking at the wiring diagrams, there are two wires to the pump, 1 in and 1 out. So it seems like cutting the relay signal would be a bit tricky, and it would be better to cut either one of the wires from the pump itself. Question is, do i cut the L-B(in) wire or the W-B(out) wire..hehe

Gary_602Z · 10-02-2005, 07:43 PM

If you cut into the main wires to the fuel pump you will need a higher rated switch to carry the current then if you splice into the relay side. Can I ask why you want to do this?

Gary

JetspeedCamry · 10-02-2005, 07:44 PM

This switch I have is rated 240V 10A, so i think it should be ok

Kill switch my friend, kill switch.

Gary_602Z · 10-02-2005, 07:51 PM

Would something on the ignition side be easier if it is possible?

Gary

***zoni*** · 10-02-2005, 07:51 PM

sounds like an AC switch to me...

what you should do is cut into the wire that triggers the fuel pump RELAY or even the EFI main relay. the one that is a low amp load. if you PM 88le, he has the electrical books for gen 2, i dont so i wouldnt know which wire you want.

JetspeedCamry · 10-02-2005, 08:05 PM

Yep, it's an AC switch, but obviously can be used for DC aswell, it just has a higher rating.
Getting to the wires for the IGN or EFI Main relay are tricky, thats why I want to just splice this switch at the back. There are two wries to the fuel pump, so switching one of them would be the easiest route. What I also want to do is have a light to tell me the FP is OFF. Ill be switching it BEFORE i start the car, and won't be turning it off until the engine is stopped, but I askd the questions before, just in case it gets "flipped" while the motor is running.

Gary_602Z · 10-02-2005, 08:34 PM

Sounds more like an anti-theft switch? If so how about splicing into the clutch saftey switch if it a manual or the neutral saftey switch if a auto?

Gary

***zoni*** · 10-02-2005, 08:56 PM

that wouldnt cut power to the whole car though, it would just make it unable to be started with a key... it could still be started by jumping directly on the starter though...