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Anonymous Posted on Aug 16, 2012

I have a 2004 corolla, fuel pump is not priming the system with key on but after the motor is cranking the fuel pump works?

It runs and starts fine the rest of the day, but the 2 sec prime does not work when you turn the key to on position!

3 Related Answers

steve noel

  • 750 Answers
  • Posted on Jun 29, 2009

SOURCE: installed new fuel pump-still won't start...pump

check for vaccume on fuelpreasure regulator if none replace

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Anonymous

  • 784 Answers
  • Posted on Oct 14, 2009

SOURCE: 2002 Toyota Corolla S. Replaced battery this

Look for a lose connection at the crank shaft sensor. This is a signal needed for obtaining tachometer as well as turning on the fuel pump.

montehammons

  • 5531 Answers
  • Posted on Nov 11, 2011

SOURCE: fuel pump won't run unless engine is cranking, but won't start

Are you sure it's running when cranking? It should have come on when key turned on.
This is for camrys up to year '91. It may apply in your '95, also. Check the 7.5 amp ignition fuse and the 15 amp EFI fuse and the EFI main relay, all located in the fuse box next to your battery. There is also the circuit opening relay tied in to fuel pump operation. It is usually found under center of dash. It is usually not the problem, but it is part of the checks for fuel pump operation.
If your car has a " check connector" or "service connector" (also called a fuel pump check connector) under hood on driver's side near the firewall (a little 1 inch cube with a cap on it), then bridge terminals +B and Fp with a jumper wire. Turn key to on (don't start car). The pump should come on. Listen for fuel return noise from the fuel pressure regulator, and verify pressure in hose from the fuel filter. If nothing, check those fuses above. Here is how power runs to pump: Battery to 40 amp main fusible link-to 15 amp EFI fuse-to EFI main relay-to circuit opening relay-to fuel pump-to ground. Ignition switch and the computer (ECU) work the relays to pass power to pump. Hope this helps some, Randy. Good luck.

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2001 Cadillac Deville. Fuel pump went out so I bought a new one. One day the car just went dead while driving it. And would not start back it would crank but not start

not true at all the prime pulse is 1 to 3 seconds
and stays off until cranked, only cranking matters
prime only speeds up the start, cranking pressure matters.
and rail pressure for sure. cranking. matters. most.
if car has IMMo you know when the key fails the engine can run for 1 to 10 seconds on some cars, to get you say out of trouble
or get the car off a curb to tow it? yes. of away from a cliff??????
hummmmm
first is learn to find the IMMO lamp on the dash and see if it is glowing the correct way as they free users guide states
fact #2:
scan the pcm when it fails to start or stalls
the scan tool tells you why, sure can, even shows key bad
try both keys yet, came new with 2 keys new. car.
both IMMO keys
modern cars need scan too to diagnose EFI
if can tell you lots of things like key bad,spark bad. or fuses blow or
well 100s of things.
scan it
and use fuel pressure gauge at the rail.
only if all fuses all good and scans show no clues.!
then check pressure with a real meter.
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Have a 2005 freestar that wont crank unless you prime the throttle body with starting fluid then it runs fine until you shut it off then you have to prime all over again. new fuel pump and new pcm

I guess you mean it cranks good but won't start? Cranking is starter motor cranking the engine. Make sure battery has a full charge and connections all good. Did you use a gage and check proper fuel pressure, key on engine off? You could try cycling the key on and off several times before you crank it, see if it helps? Another thought is to do a voltage drop test on some of the fuel components, fuel pump--fuel injectors. Engine cranking the systems get battery voltage. Engine running the systems get generator voltage, the gen voltage can be several volts higher than battery. Just a thought.
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When i turn the key the engine cranks over but does not start, if i continue to crank it for a minute or two then it will eventually start and drive just fine. any ideas?

This sounds like a fuel system priming issue. When you first turn the key to the ON position (not cranking yet), you should hear a three-to-five second buzzing noise. This is the fuel pump running to pressurize the fuel system for cranking. This is controlled by the PCM and is relay activated. Once the vehicle starts and oil pressure rises, then the fuel pump is activated by the PCM via a different relay. If you can't start at first, what is probably happening is that the prime is not occurring and you have to crank it until the PCM sees oil pressure and then fires off the fuel pump. It could be PCM wiring or a bad fuel pump prime relay.
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Hard start cold, fine rest of day

I would be checking to see why there is power to the pump with the ignition off as this is a source to flat battery overnight.. May be a relay is still activated by a power source other than the ignition.
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How can you tell if your fuel relay is bad

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Car trys to crank but want

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Hard starting Chev 2500HD 8.1 L

i have had the same problem.the solution is the fuel pump! i know you got pressure and it runs so how can it be the fuel pump? the pump is losing its prime you are getting pressure just no volume thats why its crank off crank off the system is priming itself again kinda like a weedeater or similar motor fuel is there just not enough of it to the injector To check this hook a pressure gauge turn on key turn off key release fuel should be plenty but if tis just a few drops thats it hope this helps
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