Hello--Long time lurker, first time poster. I appreciate all the insight I've gotten out of this forum for the last few years. The experience on this forum has pointed me in the right direction almost every time.
I am stumped on this problem however. I bought a new to me 2001 Chap 230 SSI, with the Mercruiser 5.7 EFI serial # 0L916255. Bought from original owner, 350 hours, relatively well maintained, but rarely used. Boat was running fine on test drive, but I could tell it needed a tune up. After purchasing, I decided to do all the probably overdue maintenance. Bellows/Gimbal, Shift cable, impeller, spark plugs, wires, distributor, and fuel filter.
Here's where the problem starts. I started it up on the hose, ran fine. Changed the fuel filter and had to cycle the pump several times to prime it. It took longer than what I thought was "normal" but it eventually primed and ran well. I took it to the river for testing before we towed to the lake, and within just a few minutes at full throttle it stalled out. Listening to the fuel pump, on the start up after stalling, I could tell it wasn't priming. Being stuck on the river, I tried multiple times trying to prime the pump with the 1st ignition cycle....many, many times. It eventually primed, and I made it back to the dock.
When I got home to start troubleshooting, the fuel pump would not energize at all. No priming, and no beep when turning the ignition on to pre start. The gauges work, and the starter will turn over...but obviously won't start. Here's what I've done:
*checked power at pump, nothing coming from the lead.
*checked power pre and post 90 Amp fuse on the starter-- 12v on both sides.
*checked all 3 fuses next to the ECM. All good.
*checked relays-- power is coming to pin 30 on both fuel pump and ignition harness.
*changed relays anyway.
*checked kill switch...all good.
*checked 50 amp red reset...good, not tripped.
*checked battery charge, it is fine and it has a newer battery.
So..now I'm stumped. My understanding is that the oil pressure sensor/switch wires powereing the fuel pump don't apply to the EFI, only carb. Before I send the ECM off to be checked...what am I missing? Is there anonther system that could be causing my issues?
I am stumped on this problem however. I bought a new to me 2001 Chap 230 SSI, with the Mercruiser 5.7 EFI serial # 0L916255. Bought from original owner, 350 hours, relatively well maintained, but rarely used. Boat was running fine on test drive, but I could tell it needed a tune up. After purchasing, I decided to do all the probably overdue maintenance. Bellows/Gimbal, Shift cable, impeller, spark plugs, wires, distributor, and fuel filter.
Here's where the problem starts. I started it up on the hose, ran fine. Changed the fuel filter and had to cycle the pump several times to prime it. It took longer than what I thought was "normal" but it eventually primed and ran well. I took it to the river for testing before we towed to the lake, and within just a few minutes at full throttle it stalled out. Listening to the fuel pump, on the start up after stalling, I could tell it wasn't priming. Being stuck on the river, I tried multiple times trying to prime the pump with the 1st ignition cycle....many, many times. It eventually primed, and I made it back to the dock.
When I got home to start troubleshooting, the fuel pump would not energize at all. No priming, and no beep when turning the ignition on to pre start. The gauges work, and the starter will turn over...but obviously won't start. Here's what I've done:
*checked power at pump, nothing coming from the lead.
*checked power pre and post 90 Amp fuse on the starter-- 12v on both sides.
*checked all 3 fuses next to the ECM. All good.
*checked relays-- power is coming to pin 30 on both fuel pump and ignition harness.
*changed relays anyway.
*checked kill switch...all good.
*checked 50 amp red reset...good, not tripped.
*checked battery charge, it is fine and it has a newer battery.
So..now I'm stumped. My understanding is that the oil pressure sensor/switch wires powereing the fuel pump don't apply to the EFI, only carb. Before I send the ECM off to be checked...what am I missing? Is there anonther system that could be causing my issues?
