I have a "new to me" Merc 240 EFI in a 2001 Seadoo Challenger 2000. My second Seadoo with this engine (first was a 2001 Speedster). I was running it in open water for the first time a couple of weeks ago and it died in middle of bay. It had been running fine for an hour or so but just died out when were coming out of a turn and would not restart. I had been doing some tight turns, throttling up and down, etc. - basically trying to see if there were any bugs (and obviously there were). After being towed by a friend back to pier (it is good to have friends) - I have been running through the test procedures in the manual to try to narrow down the problem.
Bottom line so far, I seem to have spark on all cylinders (although haven't checked timing). However, the plugs are all completely (and I mean bone) dry, indicating no fuel at all into cylinders. I have run through the fuel system checks, voltage on the electric pump, fuel flow at various points, etc. It seems that I have fuel all the way through the rail, and on the back end where the regulator is, although I am having trouble getting the regulator out to do the actual check as shown in the manual (need more daylight hours than I have right now to get it apart, funny the manual doesn't mention what a pain it is to get it out of the top of the vapor seperator housing), I do have fuel on the feed hose coming out of the rail into the regulator. I haven't done the pressure test yet - just picked up a gauge today to do that, but when I looked at it the other evening the volume of fuel coming out of the high pressure side of the electric pump would indicate to me that I "probably" don't have a pressure problem (maybe?). So - only things I can think of is that either regulator is bad, or the injectors aren't firing - which could be caused by what (ECM fail, ground problem, what?????) I do have a brand new battery in the boat as well.
Any thoughts on what I should be focusing on for my next set of evening tests? I do have the manual so referring to diagrams, page numbers, test procedures listed in there, etc. is fine. Greatly appreciate the help - am looking forward to getting this boat back in the water.
Bottom line so far, I seem to have spark on all cylinders (although haven't checked timing). However, the plugs are all completely (and I mean bone) dry, indicating no fuel at all into cylinders. I have run through the fuel system checks, voltage on the electric pump, fuel flow at various points, etc. It seems that I have fuel all the way through the rail, and on the back end where the regulator is, although I am having trouble getting the regulator out to do the actual check as shown in the manual (need more daylight hours than I have right now to get it apart, funny the manual doesn't mention what a pain it is to get it out of the top of the vapor seperator housing), I do have fuel on the feed hose coming out of the rail into the regulator. I haven't done the pressure test yet - just picked up a gauge today to do that, but when I looked at it the other evening the volume of fuel coming out of the high pressure side of the electric pump would indicate to me that I "probably" don't have a pressure problem (maybe?). So - only things I can think of is that either regulator is bad, or the injectors aren't firing - which could be caused by what (ECM fail, ground problem, what?????) I do have a brand new battery in the boat as well.
Any thoughts on what I should be focusing on for my next set of evening tests? I do have the manual so referring to diagrams, page numbers, test procedures listed in there, etc. is fine. Greatly appreciate the help - am looking forward to getting this boat back in the water.
. Good luck!!!
