HELP, I CAN’T GET THE COACH STARTED!

We stored our ’02 Marquis for November and December without shore-power, as we have successfully done in the past. I did not use the coach or chassis disconnect switches in the battery compartment, hoping that the solar panels and Echo charger would again keep both sets of batteries “toped off”. This time, however and unfortunately, I left the AquaHot Diesel burner circuit on for the last two months. We got back to the coach last night (the Aqua Hot tank & hot water were nice & hot), but, both coach and chassis batteries we “dead”. I was able to connect to 50amp service, turned all circuit breakers, switches, and inverter charger back on. I called AAA, and they sent a unit out that gave us a jump, with NO success. The engine did not even turn over, and all that happened was a “click” noise when we tried to start it. By the way, we have a fuel tank that is ¾ full.
So, we let the coach’s charger work overnight, and by about noon, I tried to start the it again, with no success, just the same “clicking” noise. I was able to start the gen-set, using the power-boost switch. When I was trying to determine the problem last night, I inadvertently left the start switch in the “filter” bay, in the neutral position (not in the “rear start”, or “front start” positions, but in the mid position, between the two.). Mid-day today, I discovered my error, reset the switch to “front start”, and was able for the first time to get the engine to “turn-over”, but the engine still would not start. The engine seems to “crank over” quit robustly – about normal. I’ve let it crank to a count of about 20, but to no avail.
I’ve been talking to my friend Jim Gillis, who also has a ’02 Marquis, and he has been helping me troubleshoot the problem. One possible problem seemed to be the fuel delivery system, but the “clear” fuel pump does appear to be to show activity, since the fuel in the fuel cylinder in the “filter” bay with the mesh screen, appears to “swirl” with an gap at the top of about 1” and a lot of agitation when we try to start the coach (Am I making myself clear?).
I do have an auxiliary “jumper battery” that delivers “1700 peak amps”, and have used it twice, in conjunction with the “power boost”, but still no luck.
We are about out of ideas. I’m hoping that someone may have some additional suggestions. Our Internet access is iffy here, so give me a call at (503) 307-5783, or post your help on the fourm. Thanks, Mike & Cathy Cleghorn