When I turn the key to the accessory position the fuel pump pressurizes the fuel rail as it should, and then shuits off, but when I turn the key further and the engine is turning over, the fuel pump does not pump any more fuel
I don't know what the other problem is...I'll give you a rundown. I pulled a 4.2 from my propane fuelled van (97-e150) I cross referenced the injectors and they were the same part #.....I then proceeded to install the engine in my 97 F-150. I was unaware how to remove the fuel line connextors from the fuel rail, so I just cut them and spliced them with a piece of steel tubing and some hose clamps. the fuel pump seems to build pressure fine, and the engine turns over, and I have tonnes of spark but it won't kick...
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Are you checking fuel pressure at the engine fuel rail with a pressure gauge hooked up, and key on? And you still hear the pump turn on for 2 seconds with key in on position?
There should be pressure in the fuel rail then. If not, is it possible you put the new filter in backwards? I would take off the line going into the filter from the gas tank, and leave off for a test: you're right, the pump turns on for 2 seconds with key on to put pressure in the line and the fuel rail. But then when the engine is cranking, the pump is turned back on. To check if the pump is picking up fuel, have someone crank the engine over while you watch at the filter: gas should shoot out in a good stream. If it doesn't, check for a kinked line from filter to the tank. If the line is good, you will have to take the tank back off and see why the pump is not picking up fuel and sending it out.
Let me know what you find. If the pump shoots out gas at the filter area, but still no fuel pressure at the engine, check the line from the filter to the engine-may be kinked, blocked, or clogged.
there is a valve on the fuel rail it look a lot like a tire valve it will have a black cap on it and you need a fuel pressure tester for the job. you can however turn the key to the on position, the fuel pump should come on for two seconds, you can then depress the schrader valve and fuel should shoot out most of the time if you have good pressure it will hit the hood, so keep back.
Attempt to start the car by turning the key to the Start/Run Position. Observe that the vehicle fails to start and that the security light is illuminated. leave the key in the 'ON/Accessory' Position. (DO NOT turn key to the 'off' position.) Allow the vehicle to sit with the key in the 'ON/Accessory' Position for no less than 12 minutes. Turn key to off position and allow the vehicle to remain in the 'OFF' position for no less than 30 seconds. Then start the engine. This worked for me.
That is a real good question. Have you checked the fuel pressure on the fuel rail to see how much pressure there is when it refuses to start? It sounds like you may be losing your fuel pressure because of the fuel returning to the tank when the engine is hot. This could be due to a faulty fuel pump assembly or a faulty fuel pressure regulator.
Try this: When it doesn't start, turn the key OFF and wait about 15 seconds, then turn it back to the ON position (do not try to start yet). Repeat this a second time, only this time turn the switch to the START position. If the engine starts, then it is definitle due to loss of fuel pressure in the fuel rail. You will then need to test your fuel pressure with a gauge and plug off the return line to determine if the problem is being caused by the regulator or the pump.
Check Fuel Pressure. First turn key to on position (without starting) and listen for the fuel pump motor. If no motor sound, your fuel pump is not working. Check fuel pump fuse and relay. If fuel pump works, check for pressure at the fuel rail (schrader valve on fuel rail for pressure testing). If no pressure, or not enough, fuel filter might be clogged or fuel pressure regulator may not be working properly. IF fuel is not the problem, start checking electrical, such as ignition control and proper spark to plugs.
When the car is running, they run constantly. When you simply turn the key to the "on" position, they run for 3 seconds (until fuel pressure in the line comes up) and then cycle off. Checking fuel pressure on the fuel rail will tell you it you have a fuel pressure problem
Do not attempt this unless you know your way around under the hood.
Use protective gear: safety glasses and protective gloves.
Somewhere on or near the fuel rail on your engine will be a plastic cap that is the same as a tire valve cap. Remove it. Underneath will be a pressure release valve, also much like your tire valve.
Cycle your key to the on position (not the start position) for 2-5 seconds. Turn key back to off position. Immediately go to the valve on the fuel rail and push the needle down. If the fuel pump is working, you shouls have fuel spray out of the valve quite quickly. The pressure in the fuel rail is about 40-50psi if the pump is working.
Hope this helps!