mercury efi failure problem?? please help suggestions needed

[Bass_Appeal]

No alarms , at all , it revs up and shuts down , no warning ! But motor completely shuts down .....turn key and starts right back up. If i put in neutral and rev up i can get it up to 5000 no problem. If i rev up under load it shuts down........

[Katie'sKatch]

I would just call mercury I have a 2005 optimax I had some problems with they told me everything to check out over the phone. I ordered the part and fixed it myself saved a lot of money. They have good customer service this is my first mercury. It won't hurt to call and see if they can help good luck +1-888-427-5373

[dfish28]

Bassappeal aren't you local to Neptune area?? It's that or Pa I'm not sure, may have a guy with the merc puter if your close...email me for #

[Bass_Appeal]

D fish im located in old bridge nj middlesex county , boat is located in matawan nj close to keyport

[Bass_Appeal]

Called mercury , and they told me more or less its a fuel issue if no alarms are sounding ....so i have to run through my whole fuel system start to finish and check everything ....to be continued

.....


Dfish if you guy is local and can run a diagnostic or let me borrow the tool please let me know ...the engine is 1996 ...

[PAFireGuy]

Bass
Seen a similar issue with a faulty fuel tank check valve. There was enough flow to run the engine but not under a load. The valve is normally located on the elbow of the fuel line where it leaves the tank. Good luck, hope this helps.

[Gerry Zagorski]

If they are thinking it's a fuel issue easiest way to find out is to hook your motor up directly to a portable tank.... If that does not resolve your issue you know everything on the boat is likley OK. If it does resolve the issue then keep on working backwards from the motor introducing more of your fuel delivery system inline with the portable tank. Put it just before the primer ball, then the filter, then the line coming out of your boat fuel tank until you get the same issue and you have found your culprit.

If it turns out the issue is in the tank, the check valve PA Fire mentioned is a usual suspect. One other thing to before that would be your fuel vent line. If it's clogged it can also restrick the flow of fuel. Easiest way to check if the vent is clogged is to simply open your fuel cap which allows your tank to vent and try and run the boat...

Good luck. Frustrating stuff but using the protable tank will help you from replacing uneeded parts.

[Bass_Appeal]

Well , rebuilt my fuel pump diaphrams , cleaned regulator , changed filters , emptied vst , check fuel lines , and still the same problem ......then pulled the plugs and they seemed fouled out , so i glass beaded them put em back in and seemed to be slightly better but still rough......im assuming new plugs and i should be ok .....go figure !