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XCR-700 · 08-05-2009, 10:58 PM

So sorry, sounds like you have been the victim of lousy mechanics and an unethical business.

I can only tell you what I would do from this point.

First, buy the coil, its very inexpensive and easy to install and will eliminate it from your list.

Next, run the boat with the gas cap off, that way there is no question about the vent, or valve, or anything on that end.

If it still doesn’t run, disconnect the fuel line from the main tank and plug it, and then get your hands on a portable tank, again its cheap and will flat out eliminate any concern about kinked lines, blocked pickups, or anything to do with the tank.

At this point its either going to run or your going to know your down to fuel pump, or distributor module and/or ignition module.

So if your still chasing it, you will again need to run it until it stops and determine if its actually “running dry” or loosing ignition.

The “running dry” theory should very easy to determine, add a simple fuel pressure gauge before the carb, you will know immediately if there is no fuel pressure, you have a bad pump.

If there is pressure, then I’m going to rule out the carb as if it ever runs well, but only acts up when hot, you probably back to an ignition problem, so if it’s a Mercruiser, I would pop for distributor module, I’ve had several die on me and its my understanding that its one of the most commonly sold parts.

My money (sorry - frappe) is still on the coil, but I reserve the right to switch to the distributor module at any time,,,

Make a plan, keep it simple, don’t go looking for things that are not likely problems before eliminating the ones that are likely, and stick to the plan and you will get it resolved.

Keep us posted.

08-05-2009, 10:58 PM	#70
XCR-700 Senior Member Join Date: Sep 2008 Location: MA Posts: 1,342 Thanks: 757 Thanked 539 Times in 314 Posts	$350 sounds crazy for a fuel pump,,, So sorry, sounds like you have been the victim of lousy mechanics and an unethical business. I can only tell you what I would do from this point. First, buy the coil, its very inexpensive and easy to install and will eliminate it from your list. Next, run the boat with the gas cap off, that way there is no question about the vent, or valve, or anything on that end. If it still doesn’t run, disconnect the fuel line from the main tank and plug it, and then get your hands on a portable tank, again its cheap and will flat out eliminate any concern about kinked lines, blocked pickups, or anything to do with the tank. At this point its either going to run or your going to know your down to fuel pump, or distributor module and/or ignition module. So if your still chasing it, you will again need to run it until it stops and determine if its actually “running dry” or loosing ignition. The “running dry” theory should very easy to determine, add a simple fuel pressure gauge before the carb, you will know immediately if there is no fuel pressure, you have a bad pump. If there is pressure, then I’m going to rule out the carb as if it ever runs well, but only acts up when hot, you probably back to an ignition problem, so if it’s a Mercruiser, I would pop for distributor module, I’ve had several die on me and its my understanding that its one of the most commonly sold parts. My money (sorry - frappe) is still on the coil, but I reserve the right to switch to the distributor module at any time,,, Make a plan, keep it simple, don’t go looking for things that are not likely problems before eliminating the ones that are likely, and stick to the plan and you will get it resolved. Keep us posted.