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Also, tried to run the heater with no cranking of the engine and with the spark plug out. There is just no fuel flow. Must be something wrong with the nozzle.

I have already taken the nozzle out of the little "manifold" on the intake and tried to blow it out. It looks like an oil furnace nozzle with a fine mesh screen on the end and some sort of tail that looks like it controls the overflow or return. As far as I can tell, the whole system is very...

Still waiting for cranetruck's input, HELP.

Pics of heater parts.

Calling cranetruck!! I know you have worked with and tinkered on the heaters for the MFs, any ideas?

Sorry, I didn't mention that the motor is a Mack. Did in the other post on the trip home, so just skipped it on this one.

I need to add that the pre-heater setup looks just like the MF, just placed in different positions. The pump is on the left front of the engine, coil on left mid rear and the valves about in the center on the left, all right up in your face to work on. nozzle and plug are in the 90 degree turn...

After getting the tractor home, looked into the pre-heater and why it did not fire. Have great spark @ plug as installed (looked through nozzle port). Have real good fuel flow when hose is removed from nozzle and solenoid valve is not stuck. Have no spray out of nozzle even if the pressure...