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A couple of things.

Before you take the coach apart, cobble together some fittings and use a 5 gallon can of diesel directly into the fuel filter. Or use the pressure sprayer. We may have crossed wires. When using the pressure sprayer, pump it up, and leave it attached until the engine runs. That way you fill the filter and line to the engine.

Getting under the coach will do NOTHING for you on the fuel line. Open the fuel bay door, and remove the shiny stainless vanity plate. All of the threaded bungs for the fuel lines are within reach. I was able to use a crow’s foot wrench to loosen the fuel line from the elbow where it goes into the tank.

If it were me, at the this point I am pulling that filter assembly and replacing with a Davco see so I can see what is going on with the fuel. https://www.jmesales.com/davco-fuel-pro-...h0QAvD_BwE. A few posts back you said you saw bubbles at the primer bulb when using the pressure sprayer. If bubbles coming out, bubbles going in. If that is true, that is where you are losing prime.

So to fill in all of what was done while I was there. I did some preliminary electrical checks to make sure the ECM was getting power and grounds. There is a voltage issue as the ECM power drops to 9v when cranking. I believe this to be the batteries being low and the battery cables are most likely corroded. I think there is a good chance it will fire if it weren’t for the second issue, which is fuel. The fuel filter has a 1” line with JIC fittings on it going to the tank. I used my vacuum and pressurized the fuel tank and removed the 1” line at the fuel filter and we got almost no fuel at all! The tank made a distinct sound and we were getting plenty of pressure in the tank. So we moved to the top of the tank, we removed the vanity panel and eventually found the correct line going to the fuel filter. After some struggling on my part, and a dumb moment of trying to turn the JIC swivel in the wrong direction, we go the the fuel line off the tank. I once again pressurized the tank with my vacuum for a second and we got plenty of fuel right at the top of the tank. So we then blew compressed air through the line, to blow out any obstructions and possibly free up the check valve. Compressed air would go through the line but we still could not get fuel through the line. I am thinking the check valve is gummed up with old fuel. The check valve is too far in to reach so we decided to try to pull the line out, we put a rope on the line so we would have something to pull a new line back in. The line was not in good shape so it need to be replaced no matter what. Unfortunately the line got stuck on the check valve and we could not get it to budge. At this point we had worked in the Florida heat for about as long as both Ole and I could stand and we decided we needed to take a break and revisit this another day. I do agree it would be nice to go ahead and get fuel to the engine and see if it will run, but we just ran out of energy to do that. I am fairly confident the engine is not getting adequate fuel. I pulled the pressure side line off the fuel pump and I was just getting a trickle of fuel, no way the engine is going to run on that. So hopefully with a new line in hand we will get it installed, prime the system and I beleive it will fire.