Fuel Problem

[Slabjack]

Hi,
I have an 86 Ford F-150 that is dumping fuel in #8 cyclinder.
I replaced the EEC computer and still the problem is there,also replaced a burned wire leading to the computer still nothing.
Maybe someone could give me advice on what is wrong.
Oh I should mention the truck turns over but won`t start.

Thank you

[DeZe]

I reckon your injector is leaking. I would do a fuel injector leakdown test, hook up a fuel pressure gauge to your fuel rail. Cycle the key from off to run to pressurize/prime the fuel system then back from run to off. Watch the fuel pressure gauge for a drop in pressure to rule out a leaky injector. You can also if you do not have a fuel pressure gauge just lift your fuel rail and injectors out of their holes and turn your key to the on position this will pressurize/prime the fuel system and you can visually see if your injector is leaking(look for fuel drippling out.)


For your cranking but not start issue, check for spark and check fuel pressure. Smack the bottom of your fuel tank to give your fuel pump some loving that may be the concern but start with checking fuel pressure.

Hope this helps