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Fuel pump on 92 Camry dose not want to turn on just

Customer Question
Fuel pump on 92...

Fuel pump on 92 Camry dose not want to turn on just installed new pump and filter turn on ignition and pump doe not turn on

Mechanic's Assistant: Can you turn the steering wheel at all? And what about the key? Is it worn or damaged?

Yes I can turn steering wheel

Mechanic's Assistant: Are you fixing your Camry yourself? What have you tried so far?

New fuel pump and filter installed no fuel pressure pump is not turning on

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Not sure what relay tells pump to turn on

Submitted: 9 months ago.Category: Toyota
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Answered in 5 hours by:
7/29/2017
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 9 months ago
Ted Ritter
Ted Ritter, Toyota Master Tech
Category: Toyota
Satisfied Customers: 4,601
Experience: Toyota Master Tech, ASE Certified
Verified

Thanks for posting

The two relays that turn on the fuel pump are the EFI and the circuit opening relay, the pump should run when the engine is cranking.

Use the diagnostic check connector under the hood, locate the terminals FP and B+ in the connector and put a short jumper wire between these terminals, turn the key on, the pump should then run, doing this bypasses the relays, let me know what happens, I'm going off line for tonight, will have more time in the morning after you reply.

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Customer reply replied 8 months ago
I did the jumper wire from fp to +B turned on ignition also cranked and pump dose not turn on?
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 8 months ago

Thanks for the reply, is there 12 volts at the B+ terminal in the check connector?

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Customer reply replied 8 months ago
Using multimeter from B+ to ground no reading to positive on battery 12 volts
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 8 months ago

Thanks, ***** ***** to be sure I understand before going off in the wrong direction, there is no voltage when measuring from B+ to ground? The key has to be ON.

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Customer reply replied 8 months ago
that is correct
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 8 months ago

I'm going to look at a wiring diagram to see why that is.

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Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 8 months ago

In the fuse box under the hood pull the EFI main relay out, check voltage at each terminal where the relay plugs in, turn the key on, there should be about 12 volts to two of the terminals.

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Customer reply replied 8 months ago
there is 12 volts
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 8 months ago

With the relay in does it click when turning the key on and off?

Is this a 4 cyl or V6?

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Customer reply replied 8 months ago
It's 4 cyl and I tested the relay earlier by putting 12 volts to rely and I could feel it pull in but I can't feal it pull with it plugged in and turn key off and on
Customer reply replied 8 months ago
I was wrong when I put 12 volts to relay it pulls in but the thermal block in car when key is on no voltage comes to there if you get what I'm saying
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 8 months ago

Ok, could be a bad ground at the relay or an open wire between it and the B+ terminal at the check connector, it sounds like it's not working when plugged in. I'll try to keep this as simple as I can without having to send a diagram. Pull the relay again, make not of which two terminals have voltage with key on, there are two left, one is ground the other goes to the B+ terminal a few other components. With voltmeter plug the negative probe into either of the remaining terminals, touch the positive to the battery positive post, if you see voltage then that is the ground, do this for the other terminal, one of them is ground whichever shows volts. The remaining terminal goes to the B+ in the connectror, now make a short jumper wire from one of the terminals with 12 volts to the one that is not grounded. This will complete the circuit and there will be or should be voltage at B+ Let me know how that goes.

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Customer reply replied 8 months ago
No voltage come to block that need voltage to pull in relay
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 8 months ago

Sorry, I'm a little confused now, you said there was voltage to two of the terminals in the space where the relay goes.

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Customer reply replied 8 months ago
Sorry for confusion I jumper out EFI and get power to pump and B+ termanl so dose this mean relay is no good
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 8 months ago

Yes, That is what it sounds like, go ahead and put another one in and see what it does, I think it will fix this.

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Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 8 months ago

Let me know

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Customer reply replied 8 months ago
I have to order one I will let you no thanks for now
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 8 months ago

You're welcome, good luck.

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Customer reply replied 8 months ago
Hey Ted I've been real busy but picked up EFI relay did not fix problem so what next I'm going away until next Tuesday so I will ask questions then
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 8 months ago

Ok, let's continue then, one other thing you may want to try to eliminate the fuel pump and the associated wiring but not relays: run a hot wire directly from the battery to the FP terminal in the check connector.

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