Motor shuts off while driving

[Fred Cook]

Well, I guess I stand corrected. But my rear run box has a “Fuel FTR Relay” labeled on one of the circuit boards.

[Frank Bergamo]

Just a guess, but most of Monaco motor homes have a Cummins motor in them. Different fuel delivery system than the Cat motor homes.

[Joel Ashley]

As others have suggested, the dash ignition can go funky, as ours did long ago on our Pace Arrow.  But pointed out here also was the ignition solenoid in the street side forewardmost bay, a quite common failure device.  So be sure to review online its proper operation, then check that it passes clean and full 12v through as designed.  It's not expensive, easily replaced, and many of us carry a spare.

Also from your description and I believe mentioned here, check your alternator output if your chassis batteries aren't fully charged after a short time on the road.  Many owners break a dry camp without using the generator for awhile beforehand, and overwork the alternator to build back the house batteries, a job its not designed to do, and resulting in its being burned up.

Joel

[Steve Huber]

Hi Fred,
A few observations;
If your radio or other entertainment/dash functions stayed on when the engine died, it probably is not the ignition switch.
If the engine starts immediately after shutting down the fuel pump is probably OK.
A faulty relay, bad connection or fuel jelling is probably to blame. Consider replacing the Fuel FTR (Fuel Transfer Relay) relay out of caution.
Before throwing any more parts/$ at it, consider trying it in warmer weather to eliminate fuel jelliing.
Steve