My 90 F-150 4.9 Injected truck will turn but it will not fire. I have replaced the spark plugs,wiring and fuel filter. I also have good spark,but, I noticed that I have a low fuel pressure to the injectors, and I noticed that I cannot hear my fuel pump when I turn the key on. The question is, does this model have a high pressure fuel pump and if so, where is it. Any suggestions would be greatly welcomed.

 

Most 90's have 2 tanks, but some only have one. 1990's have only 2 pumps in each tank. If you only have one tank you'd just have 1 pump, it would be hi psi. 1989 and earlier have 3.