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I have recently had intermittent issues with spark and injectors. Problem has been traced to corroded ECU connector where it joins the engine harness. Does anyone have an ECU that has been tested and declared dead that has a good harness? I considered buying a used ECU, but was told by...

on Merc 240 EFI, the fuel pressure regulator, located on top of the VST, made by Keihin. What is the purpose of the small hose that runs back to the block? My pressure is running 65 psi. Seems my reg. is dead. I am in the process of adding an adjustable reg. ahead of the Merc reg. Then I...

Welcome back Dr. Honda! Has anyone found a suitable alternative to the Merc pressure regulator on top of the VST? (Engine built in 2000.) Stupid expensive at $300, other look-a-likes less than $50. Just like the price on the TPS. Engine seems to run OK with pressure @60 psi. Smokes a lot...

Hi everyone! I have a 240 EFI engine that had the float needle in the VST stick, as in corrode to the seat. In the process of repair, the hose from the top of the VST pump to injector rail was cut. Hose is about 3 inches long. It has a 90º bend and a 30º bend. Hold your hats folks---- Merc...

Hello to all. I have some issues with battery charging from alternator. Engine is Merc 2001, round engine cover, under flywheel alternator. There are 2 sets of charging coils and 2 voltage reg's. At 2000 RPM, the upper VR gets too hot to touch after 5 minutes. The lower VR temp barely...

Hello all. Mercury 240 EFI. Challenger 2000. Out today, engine stalled 3 times today, restarted easily. Checked for water in fuel filters, vapor separator. Spark plugs oily, (too many no wake zones), compression 145-150 on all six. Checked TPS--OK. Does anyone know the symptoms of a...

Hello everyone- On my 2001 Challenger, several of the connection tabs on the fuse block in the helm box are corroded into oblivion. Is there anything inside this box (as far as logic, or chips) or is it just simple fusebox? I would like to replace with a more robust fusebox (non-Seadoo)...

Hello everyone I thought I would share my experience repairing my Merc wear ring. While mine was not badly damaged, it did have some wear. The clearance between impeller and ring was about 1/16 inch. I wanted it a little smoother and less clearance. At first, I tried a product called...

Hello Everyone. I am new to the formus, but not to jet boats. I built one in high school (9ft. w/ 82 hp snowmobile engine) to my present Seadoo 2001 Challenger 2000 w/ Merc 240 EFI. I have a bad TPS. Erratic resistance (unplugged) through all rotation. This TPS had been replaced 3 years ago...