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Back to the FD791D. Replaced coils , { thanks for the info} engine now starts but runs rough. Disco the . Vacuum Pressure Sensor, engine runs much better, replaced pressure switch and vacuum tube, same problem. Any ideas!!

26psi

Over 30 years in the mower business, Have my own shop. Usually no problems trouble shooting problems. Have the inter connect for trouble shooting this type of engine. this one has me stumped. Starting to think something with the coils

26psi

Really ?? LOL

Dont really think fresh fuel would help if injectors are not working.

Will only run when spraying starter fluid

Have completed all test more than once

Light not flashing codes. Can manually fire injectors

Wiring from coils to ECU checkout good. Have tested ECU on on other unit, works fine. discoed kill wire to ignition, tested injectors, they work. This one has me stumped. Starts on either, so coils are working.

Does FD791D have a speed sensor? Injectors not firing. Thanks

You are correct, no diode. Checked coil kill circuit, seems to be functioning properly. This one is a stumper !

Thanks for the info

Shows a diode in line. Cant seem to locate. Any ideas where its located? Have the wiring diagrams but thanks for posting.

Thanks for the info. Is it using both coils or just one.

Fuel and pressure are fine >

All sensors reporting back to ECU with correct voltages .

Yes, coils are fine. Injectors not squirting fuel.

Have 12v on white wire to injectors and good at ECU. Thanks

Already changed relays. injectors test good. just wont fire. Have 12v on white wire to injectors and good at ECU. The issue is like crank sensor not working . Too bad this engine doesn't have one!

Already changed relays. injectors test good. just wont fire.

Have 12v on white wire to injectors and good at ECU. Thanks

Fuel pump is working, safety switches by passed. Will start with starter fluid but then dies. Injectors are not firing.. preformed test and keeps saying to replace ECU. Switched ECU with another mower, no change. Hooked light to injector leads, doesnt flicker when engine is cranked. Got me...

Have and FD791D on a Turf Tiger. Engine cranks but wont start. Will start with starter fluid. All voltages at ECU are correct. Fuel pump pressure correct, all relays working. . No error codes.Grounds are good.Fuel pressure sensor and regulator good. Any Ideas or suggestions ?/ Thanks

I have a Dixie Chopper Silver Eagle. The outer wheel seal behind brake hub started leaking. I relaced the seal, drove it for awhile and the seal started leaking again. Seal is in correct.Seems like the wheel pump or wheel motor is bulding up presureand making the seal leak. Is there a pressure...