1985 Toyota Corolla Fuel Delivery

85TOYOTACOROLLA

MEMBER
1985 TOYOTA COROLLA
4 CYL
FWD
AUTOMATIC
160,000 MILES

My son was driving our 1985 Toyota 4-door liftback (gas powered with EFI) on the interstate at approximately 60mph. It was a very hot day and he was worried that the car might over heat so he slid the temperature control to the heat setting and turned the fan on high to help vent heat from the cooling system in the heater core. When he did this the car began to slow and would not restart. After I got the car towed home I took the fuel line in front of the fuel filter lose and had my wife turn the ignition. No fuel pumped from the tank.

I noticed that the "Green" fusible link (40 Amp) mounted on the battery cable was corroded and one of the wires was melted and not attached. This fusible link may have already been like this and not even related to the current problem because the corrosion appeared old and I think I remember the wire not being attached before this happened.

I have checked every fuse that I can think of that may be connected to this problem. I realize that the in-tank electric fuel pump may have just went bad, but given the fact that it happened when he was turning other electrical items on I can't help but think there may be a connection. I have not been able to find a wiring diagram of this specific year and model, but on another toyota wiring diagram I noticed that the Heater blower (in the heating unit) and the fuel pump used the same relay. Any help you can offer will be greatly appreciated.

Thank you,

RW

5 Replies

MMPRINCE4000

MECHANIC
8,548 POSTS

If there is a diagnostic port in the engine compartment, short B+ and Fp. That will send 12v directly to pump.

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Thursday, July 9th, 2009 AT 9:59 AM

85TOYOTACOROLLA

MEMBER
3 POSTS

What do you mean, "If there is a diagnostic port in the engine compartment?" If you are an expert aren't you supposed to be telling me if there is a diagnostic port in the engine compartment and where it is? Sounds to me like some BS, like you are trying to act like you know what you are talking about without really having a clue.

Instead of guessing, I would like to hear from someone that actually knows where the relays and fuses are in my car and knows which ones would be related to the fuel pump not operating.

Please, if you don't know what you are talking about don't try to BS your way through.

Any legitimate help would be greatly appreciated.

Thanks

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Thursday, July 9th, 2009 AT 4:37 PM

MMPRINCE4000

MECHANIC
8,548 POSTS

Toyota made early FI engines like the 4AFE used in the MR2.

This engine was carried over into the early 90's as the base engine for the Corolla.

They had a diagnostic port on the left side shock tower, labeled "Diagnostic". That is what I was talking about. That is the easiest way to check the FP.

There is no need to get nasty Bub. If you don't like my advice, don't take it, buy a Haynes manual.

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Friday, July 10th, 2009 AT 9:15 AM

85TOYOTACOROLLA

MEMBER
3 POSTS

Bub, was my question about an MR2? Even in this feeble attempt at a reply you still offered no legitimate help for my problem. There is no such box on my car, plus being able to make the fuel pump work from a diagnostic box would only tell me that I have a relay or fuse problem, which I already suspect. What I need to know is what fuses or relays are related to the operation of the fuel pump and where are they located.

If there is anyone out there that actually knows about my specific car model any help you can offer will be greatly appreciated. What I don't need is speculation about other vehicles. If I wanted that I could go down to my local parts store or my barber shop where everyone has an opinion.

Thank you,

RW

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Friday, July 10th, 2009 AT 9:33 AM

MMPRINCE4000