2000 Merc 40 HP four Stroke cuts out

[rmeyer]

I'm having a problem where my engine cuts out after I plane out the boat (WOT) and then drop back on the throttle to cruising speed. It will do this several times, but after the engine has been run for a while it runs fine. It starts and idles fine. I haven't tried anything yet but I was going to try replacing the fuel filter and plugs. Any suggestions?

 

[graddy]

Re: 2000 Merc 40 HP four Stroke cuts out

When the engine cuts back are you getting a horn going off?

 

[rmeyer]

Re: 2000 Merc 40 HP four Stroke cuts out

No horns going off, plenty of water streaming out of the engine.

 

[graddy]

Re: 2000 Merc 40 HP four Stroke cuts out

Its possible that the fuel presure is droping in the rail or your fuel going to the engine is being resticted. If you squeeze the primer buld does the engine pick back up? You would need a fuel presure gauge to check fuel presure in the rail.

 

[graddy]

Re: 2000 Merc 40 HP four Stroke cuts out

this is a EFI or is a carb?

 

[rmeyer]

Re: 2000 Merc 40 HP four Stroke cuts out

I'm pretty sure its carbed, and I already had someone squeeze the fuel bulb as the boat planed out(WOT) and dropped back on the throttle and it still cut out. but after trolling for 15-20 minutes and then trying it again the motor ran fine.

 

[NRG]

Re: 2000 Merc 40 HP four Stroke cuts out

Check your fuel water seperator. Sounds like the problem I had last weekend almost exactly. I took mine off and there was some water in the fuel. So I got some Water Zorb and changed the fuel water seperator. It has run perfect since. good Luck

 

[rmeyer]

Re: 2000 Merc 40 HP four Stroke cuts out

Where is that located on the motor, is it part of the fuel filter or attached to the motor itself?

 

[NRG]

Re: 2000 Merc 40 HP four Stroke cuts out

It should be near the back of the boat. Mounted to the transom possibly. It looks like an oil filter. It is not attached to the motor but, to the fuel system. It is rather large so the should be no problem seeing it. It should look like this <br /><br /> http://www.perma-cool.com/Catalog/Cat_page26.html <br /><br />Hope this helps.

 

[rmeyer]

Re: 2000 Merc 40 HP four Stroke cuts out

I use portable tanks so I assume I don't have one. Maybe it's just bad gas.

 

[NRG]

Re: 2000 Merc 40 HP four Stroke cuts out

Empty it out and give it a try