Comanche running rich

[90MJPoineer]

I’ve got a 90 MJ that’s running rich and i can’t seem to figure it out. I bought it with a bad head gasket and got it running only to find out it had a bigger camshaft installed. I found the paperwork under the seat for it attached. I’ve been replacing everything i can think of to help lean it out to no avail. New coil, cap, rotor, wires plugs, tps, cts,o2, and still running extremely rich. Fuel pressure when running is 40psi. Priming the pump with engine off is 10psi, then it bleeds down quickly. Is the bleed down normal? What else could be the issue?

[Ωhm]

28 minutes ago, 90MJPoineer said:

Fuel pressure when running is 40psi.

Fuel pressure when running should be ≈31psi.

 

28 minutes ago, 90MJPoineer said:

Priming the pump with engine off is 10psi, then it bleeds down quickly

Priming the pump, engine off, should be at 39psi and hold. Bleeding down is sorta common with faulty check valve. Shouldn't cause RICH condition, unless your leaking fuel off the Fuel Pressure Regulator (FPR) and into the intake manifold.

[90MJPoineer]

So could i be getting too much fuel pressure?

[Ωhm]

With Engine Running, fuel pressure should be ≈31psi.

[cruiser54]

Or the gauge could be inaccurate. 

Pull the vacuum line off the fuel pressure regulator and see if there's fuel in it. 

Also, the line from the throttle body to MAP sensor will cause rich problems if it has any vacuum leaks.