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Re: 2003 toyota celica
Your diagnosis is correct. The check valve in the fuel pump is letting the gas drain out of the line from the injector rail, and cranking for a long time then starting is indicative of this. Replace the fuel pump.
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It sounds like the fuel pump is going bad. If you had a fuel pressure tester you could check dead head pressure with the vehicle off and in the run position. A good operating pressure is about 41psi estimation. If you see the pressure drop right away and does not hold the pressure then the check ball or fuel pressure regulator is bad and you need to check those. Im giving proper diagonis procedures before buying somethimg you dont need. You can check a fuel pressure regulator with applying a vacuum to the valve and if the valve diaphragm holds pressure then it is good. Then all you have left is a bad checkball inside the fuel pump assembly. Unfortunately, if the ball valve is bad the whole fuelpump needs replaced. If you replace the assembly replace the filters too. A good tip to save the life of fuelpumps is to never allow the tank to run below a quarter tank because the fuel acts as a cooling system for the pump.
When you say the pump has been serviced, what do you mean ? Usually when it fails to start cold, the fuel pressure is very low. And that is often because of a faulty check valve in the pump allowing fuel pressure to drain back into the tank.
This can be caused by a defective electric fuel pump inside the fuel tank. The problem that occurs is that the fuel pressure check valve in the pump fails, this lets the fuel drain back into the fuel tank and causes long crank times/hard staring and stalls on initial start..
Hi,Yea that's kinda weird,could be the fuel pump check valve.is going bad inside the pump. its supposed to keep fuel from draining out of fuel lines back into tank ( thats why it will crank easyer if it does not sit to long) but after sitting overnight,ect. its letting the fuel drain out of the fuel lines and you have to crank it that many times to get fuel back to engine. just an idea! good luck. yz-maniac.
What do you mean by trouble starting. Do you mean extended cranking time for the first start? If that is what you mean, than you may have a bad fuel pump check valve in the tank. The fuel in the fuel line drains back and requires an extended crank time to push the fuel back up to the injector rail for a start.
U are right about the gas draining back to the tank, the electric fuel pump in the fuel tank has a check valve built into it to prevent drain back, the system should always have pressure, to check this u will need to hook up a fuel press test guage at the test valve on the top of the eng near the injectors, run the engine and shut it down, the pressure should not drop more than 5 PSI overnight.
the most common cause of this is a defective fuel pump check valve, if this valve is not working the fuel drains back to the tank and each time u start it the fuel must be pumped all the way to the injectors, then the air must bleed out, this causes long crank times and stalls after starting, the problem gets worse with cold temps of winter.
this is caused by the fuel pump pressure check valve, when this valve fails the gas drains out of the lines and filter and back to the fuel tank, then when u start the pump has to pump the fuel through the lines and filter and then the air has to be purged out of the system by the injectors, this all takes time, result long crank times and numerous start stall. The pressure check valve is part of the fuel pump, the pump is in the fuel tank.