2001 OX66 225 will not plane

[eddy2419]

I do not know the service history on this boat as it is new to me. Boat ran for about 12 hours then would not plane (we were on vacation). As it starts to go bow up it reduces RPM's but doesn't die.

Replaced LP pumps, clean VST but it wasn't very dirty. Replaced Racor, cleaned filter inside the cowling, replaced bulb and als tried to run it from a seperate tank with no luck. Plugs are new.

There seemed to be some improvement after the LP's were replaced. I partially cleaned the O2 sensor with carb cleaner. I unscrewed it from the top, did not remove the housing and did not clean out the tube. Nor did I use ring free.

Another possible screw up is I used soft permatex for the VST tank as the gasket swelled up. I have a gasket now.

The boat has been in the shop 3 weeks and they can't promised it will be fixed by next week when we go on vacation. I will have to pick up the boat Thursday or Friday if it is not fixed and try it myself this weekend. The above work I did on vacation without much knowledge of the engine. I know more about it now but am by no means a boat mechanic.

I am thinking a new O2 sensor and gasket, properly installed, tube cleaned out (I have the link to the proper procedure now). Also tear down the VST and check the filter then get the Permtex off and install the gasket in case the permatex fouled the screen.

Obviously shots in the dark but I am desperate at this point. May as well not go on vacation without it and lose $1200 rental already prepaid.

Replies are greatly appreciated.

 

[rodbolt]

Re: 2001 OX66 225 will not plane

you will need to properly Identify your block for the 3.1 gasket kit for your O2 sensor.
your O2 sensor isnt your problem though.
you will need to check fuel system vacum at the lift pump intake and fuel rail pressure from the VST.
a run with the diagnostic test lamp will eliminate any other sensors as a culprit.
if you dont understand closed loop EFI you may wish to take a mulligan or be prepared to purchase some special tools and wire harness test adapters.
if you still have the inline check valve between the lift pump intake and the engine fuel filter remove it,unscew it, dump the guts and reassemble it.

 

[eddy2419]

Re: 2001 OX66 225 will not plane

Thanks rodbolt for taking the time to reply.

Fortunately the mechanic called and said it was ready. Evidently I screwed up by using permatex when I checked the VST creating 2 problems. So when I replaced the LP's after wards, which I'm pretty sure were bad, the gummed VST/fuel system was holding it back. At least I think so. Anyway it is running so we can take it to the coast next week.

Again thanks for taking the time to reply.

 

[scjmc]

Re: 2001 OX66 225 will not plane

Whats the deal with that check valve anyway? I am having a fuel flow problem too. I cleaned the VST and checked the LP pumps and I am still having a problem.