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I did buy Ford f 150 van with 4.9l the last owner did drive with leak injector and did destroy the engine. I did take it out off the car and rebuilt it everybody did want to give me good advice take the A/P pump away it does nothing so I did that put the engine in the van then i took the fuel tank out and did clean it put new fuel pump in it then i change the high pressur fuel pump and filter I flush the fuel lines change the injectors and fuel pressure valve then did I start the Engine it did run ok for a few minutes then did it happen the Engine was running and was powerless and I did get fuel in the oil (I hate this car) I flush all the fuel lines again and did one of the old injector in (injector in this car cost 250$ piece here in Iceland) Now I have a car wont run very low spark on the sparkplug and nr 1 injector will not sprayI have a one qeastion what doesA/P pump?if you have a information for me Im all open