First let me say that I'm very thankful for all the people who have helped me solve my previous problems and hope that the solutions can be of help to other persons experiencing similar problems. Thank you.
I tried searching this forum but couldn't find anything directly related to this (although seems to be a usual problem in general) so here goes:
1) Cummins diesel B5.9 (1994 or 1995) in Holiday Rambler 1995 (Oshkosh).
2) Engine starts perfectly and the fuel shutoff valve ("stop solenoid" seems to be working), that is it's pulling up to open the valve.
3) When turning key from run to off the dashboard electricity is turned off but engine remains running.
4) Shutoff valve is still in open position so here seems to be the problem. When I manually close it the engine stops.
5) I just now measured the voltages in the harness (black-ground, white-pull up, red-hold up) and while I unfortunately couldn't measure the start voltages it looked likes this:
Key = OFF: Pull up 0.0V, Hold up 0.0V
Key = RUN: Pull up -
0.4V, Hold up 11.70V
I realize the battery is pretty low (charging at the moment) but any suggestions?
Q1: How exactly is that stop solenoid supposed to work? Shouldn't it automatically go back with spring power to valve = shut when there is no electricity coming from the wires so bad ground etc should rather prevent the valve from opening than closing? Could the engine+alternator running in some way be generating electricity to energize the solenoid because of some connection error somewhere?
Q2: The Dodge owners with same motor seem to have this problem and the main suggested fixes are 1) Don't replace the solenoid (well, I did that, the old was in pretty horrible shape anyways
) 2) Check the blue cable going to the battery and 3) Replace the relay, so where would I be looking for these in my HR and (
) what does that relay look like?
Picture of my new (and expensive) fuel stop valve installed