Well replaced line from tank to first filter housing on frame about 2 years ago, last owner replaced line from primary to secondary filter. Replaced all filters, lift pump, check valve on return line. Replaced all fittings. After priming system and starting, she'll go down the road without an issue. No smoke, no loss of power. if coach sits for a day or so, and is on a forward angle, as per my driveway in front of the shop, it will start, run for a few seconds, and turn off. Will not restart unless primed again.
Had tank out twice already to inspect fittings and top of tank where it draws from.
The problem still exists and Im running out of summer, patience and ideas !!
ANY HELP WOULD BE GREATLY APPRECIATED !! Thanks Folks
This may sound strange to you, but your symptoms are similar to something I've seen before, I'd check to see if there is only one rubber gasket under the primary filter and there wasn't one stuck up in there when you changed your filter.
jk
What about the line from the secondary to the injector pump, banjo fittings loose?
Air is the culprit but finding the source can cause a few grey hairs to grow. Return line to the tank could be leaking past the valve that keeps pressure at the injectors. If you have a Bosch P pump, check the valve on the back side of the pump. Or, one leaking injector can cause loss of pressure in the system requiring priming. Fuel pump may be leaking, even causing diesel to get into the crankcase. Check hose at the clamps including the fuel tank. New clamps of the wrong type may damage the line. They should be the full wrap, Euro style.
Pierce
A question, not a proclamation...
What would be necessary to gently PRESSURIZE the supply line, where a person could look for leaks?
Thinking... Plastic wrap over the secondary filler, a bolt in the tank vent, a sacrificial gas cap with an air fitting installed...
The a person could LOOK for the fuel dribble, not be chasing air.
Many leaks are so small that it's probably not going to show any fuel at a leak. And, a leaking injector or fuel valve allowing the fule system to lose pressure could not be found that way. Small sections of the fuel system could be isolated and then tested with a Mity-Vac with a vacuum pulled and then watching for the gauge to move. https://www.harborfreight.com/mityvac-vacuum-pump-39522.html
Easy to go to a Pick N Pull yard and buy a electric fuel pump off a fuel injected car. They put out about 50-60 psi, just right for priming the system or when changing fuel filters and perfect as our Detroit's lift pump puts out about 55 psi when the engine is running. I like the Bosch pumps used on MBZ, BMW, VW, etc. About $15 at a yard. 5 or 10 seconds with a momentary switch would be plenty if the system has a little air in it..
Here is the valve that had a crack on ours in Tom Hall's web page. It let air in and made for hard starting. He has a good diagram for how to install the electric fuel pump. Tom Hall (https://coachconversioncentral.com/tomhall.htm)
Pierce
Till every line from the tank to the engine was replaced, one after another I too had the start and die symptoms.
And anytime I parked without a full tank, the engine would start, run, a 10-15 count and die.
Interesting, I'm told that could indicate a leak in the pickup tube in the tank also allowing air into the system. Im considering getting my tank inspected as well as replacing all the fuel lines and filters. Hopefully that'll keep me off the side of the road ??
Jimmy,
1. The way the pick up tube is made and installed in your tank it is highly likely that your problem is elsewhere.
2. With the age of your coach this is where you should be looking for the air leak. If you have the Racor 200200 fuel filter the "O" rings are suspect not just the filter element and it's gasket.
Mike
Last things first. Being on the side of the road is not such a bad thing when you're at home. Sometimes a few road flares to warn traffic is in order but you always have time for a cup of coffee.
First thing second. "I'm told" to me is ærobic exercise. What I see is what i got. There isn't that much to a fuel system, it's a finite number of potential leaks.
Starting fresh with all new flexible fuel lines is, in the long run, cheap. Then take what has been said previously and make a list and order it from one end of your fuel system to the other. It's grunt work, but then again so is life.
Art
Unnecessary verbiage:
I've spent 5 weeks so far tracing wires in the Studebaker, connecting them properly and removing the previous owner's additions to keep the car on the road. It's a job I dreaded because there's no way to plan, as in no firm end date, but it needed to be done. We took a 160 mile road trip to bring home a generator, which is replacing the one-wire alternator, and in the pouring rain, on a down hill run I pulled the accessory headlight switch and everything stopped. Turning everything off then back on again brought the electrical system back on line, but Lynn was sitting next to me, so I had no choice but to trouble shoot the electrical system. It is nice to have everything work as it should.