I have a 1992 f150 that will not start. It has a new fuel pump that works great. 50 psi at the rail. I plugged in a noid light and the injectors are getting fire the pcm is working and has power and the engine has fire. I can spray fuel in the intake and it starts up. cranks over great just not gettinn fuel. the truck was run off propane and we decided to switch it back to gas. is it possible all of the injectors are bad? I have changed the fuel pressure regulator. I have run to the end of my rope. any help please. the only thing I can think is the injectors are plugged from non use.

 

forgot to put it's an inline 6

 

anyone have any ideas?

 

the truck was run off propane and we decided to switch it back to gas.

Did you replace the injectors, put gasoline fuel injectors back in it? From what I understand they are not the same?

 

The propane system is injected into the breather tube just before it attaches to the throttle body. The injectors are not changed in any way. They just un hooked the fuel pump so it would strictly run off propane.

 

What is your fuel pressure?, (psi)
If it was kicking it sounds like you have spark, did you visually check for spark?
If you have spark and the correct fuel pressure then it may be flooded, pull the spark plugs see if they are wet and black. If so replace them and dry out the cylinders, check your oil it may have gas in it from being flooded

 

Ok so the injectors sat unused for a long period of time, probably with regular no-lead in them, if so probably all gummed up because of it.

Can you hear/feel the injectors clicking? You should be able to feel them doing so just by putting your hand on the fuel rail. Or using a long screwdriver on each one like a stethoscope, blade end on injector ear to handle end. Keep in mind if gummed up they could still "click" but fail to allow any fuel through.

 

It had 50 psi to the injectors. I got it running. All six injectors were bad. Pulled the rail turned it over and no fuel. Robbed some out of another truck and they sprayed.