1988 mustang LX 5.o wont start.Can here fuel pump prime when i turn key and can here it prime agian when i turn key back.

Pump still runs because hasn't started and is in cold start mode. Get power to the coil to get it running first, then see if the pump shuts down when switch is off.

fuel filter, fuel pump relay, faulty fuel pump.

I would check the EEC relay and the fuel pump relay for power and ground signals first. Both circuits are controlled by the ignition key switch. The fuel pump should be powered for 3 seconds when you turn the key on.

you need a new pump for sure your screen on your pump came off

fuel pump relay is located under the drivers seat.

If this doesn't do it, see my tip at http://www.fixya.com/cars/r5821173-doesnt_car_start_gasoline_engines . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me

All cars require a little priming. Try this, turn the key on, let it sit for about 30 seconds then try and start your car. When you first turn the key, the fuel pump will begin pushing fuel. My Mustang does the same thing when its been cold. Of course, in Tucson it does not get cold very often.

An engine temperature sensor that halfway works could be telling the ECM that the engine is already warm but the problem is more likely to be a fuel pressure problem or both. A fuel pressure leak-back within the system or lack of initial prime cycle ( the prime cycle is activated for about 3-5 seconds when the key is turned to the on position regardless of whether you start the engine or not.) To check this; have someone listen at the fuel tank (unless your pump is noisy, and most of them are) and when you cycle the ignition all the way off for about 5 seconds and then to the on position ---WITHOUT TRYING TO START IT-- you will hear the pump make a buzzing sound for 3 to 5 seconds each time you cycle the key off for about 5 sec and on for 5 seconds. If you can hear the pump cycle while doing this test then try cycling 2 times before starting and if it starts immediately each time then you will probably need to replace the pump or regulator depending on a couple other tests to find out which one. If you have very high mileage and cylinder wear then it may also take a little longer to start. it should never take more than about 4 seconds to start and 2 to 3 is even better. look into those couple things and any questions or additional information --just ask

ck for water in gas. try to start with ether.

shack

I had two vehicles in the last month do this and when i dropped the fuel tank the rubber line in tank between the pump and pickup tube was broke not alowing fuel to be sent to engine