Fueling/Motor problems - would appreciace input

[eggsuckindog]

Check anything lately, its almost the weekend

[eggsuckindog]

I may have been tad abrupt but I just want to get you back out there without spending bunch at some marina for nothing - my phone number is in my sig - I want your next post about a Tuna not fuel issues- isolate and eliminate your road to boating bliss

[mbo_1971]

Thanks guys for all the suggestions. I will apologize to ESD for not following his directions post haste – I was just hoping to try and troubleshoot without investing anything if not needed. Buying a remote tank was going to be another $75+ that I would rather not have spent if it was something simple and obvious at the main tank. So this past weekend I was able to give this a shot.

After popping the cover plate I found the following:



Clockwise from 7 o’clock are:

- fuel pickup

- fuel fill line (brand new)

- fuel vent line (brand new)

- mystery – alternate fuel pickup (more on that in a min)


First thing I did was inspect the fuel vent. I disconnected it at the tank and blew back through. No significant difficulty in passing air through the line and there was no resistance and no change in pressure (like something moved in the line). I think this one can be checked off the list.


Next I moved to the fuel pickup.

In focusing on the fuel pickup, I see the following:



I'm a bit intimidated here – is it me or does this think look welded in? Maybe this is how they all look on tanks of this age? I gave it a little torque, but there was no movement. I really did not try too hard as I did not want to break something off here. I'm all ears on how to think about this one, but needless to say, since it looked welded in, I didn’t try too hard.


Another question here – should the anti-siphon valve be on the outside of the tank attached to the elbow? The only thing that was attached was the fuel line nipple, and it was straight through (no valve inside). Could the anti-siphon be inside the tank?

This lead me to the 4th item under the cover plate – the alternate fuel pickup. Any thoughts on this one? Is it worth trying this as a possibly un-clogged fuel pickup – just move the fuel line nipple over from where it is now?

Since I struck out on the main tank, I bought a 6-gal Moeller tank with 3/8’s supply line, fuel bulb and in-line filter (just in case). To isolate that this was a motor problem, I have done as suggested and hooked this tank directly to the fuel line feeding the fuel pump. Bulb pressurized no problem. Motor fired up no problem. Idled with no noticeable problem (the 200 HPDI is a bit of a rough idle as it goes to 4 cyl during idle). Into gear and up to 1300 rpm no real issue, but thought I noticed a little miss here and there. Shrugged it off as me being overly concerned. Putted the ¼ mi of no-wake at 6knts no real issue. Once out of the no-wake, I slowly throttled up. 2K, no prob. 2.5k, no prob. 2.8K and motor bogs. Pulled back throttle. Putted at 1300 rpm for another minute to think it over, and gave it another shot. Same issue – at about 2800 rpm, motor bogs down.

The upside is that I now have an issue isolated at the motor – a place to start. My first guess is the filter below the fuel injector. That will be this weekend’s project.

I am now thinking that I now have 2 issues. First is a clogged filter in the vapor canister (understand how that would have happened if you read my last post – bypassed the 10micron filter for a short time). The second is in the main tank and likely thinking it is the screen on the bottom of the fuel-pickup line and or (assuming it is inside the tank) the anti-siphon valve. It’s a 25 yo. tank and prolly has a bunch of crud in it that I am going to have to work through will its cleaned out and caught by the main 10micron filter.

Thoughts or suggestions from here are welcome. Specifically, thoughts on how to attack the elbow at the tank. Thanks again for hanging in there with me on this one. Much appreciated.

[Old'sCool]

From the pic it looks welded to me. Mine is screwed in and was VERY tight. The anti siphon is basically a ball inside the piece you're trying to unscrew. It would stop flow out of the tank if inverted. The VST tank contains the HP pump and yes, this screen can become clogged. It's not a bad job. I've done my OX66 a few times.

[eggsuckindog]

Well the plot thickens LOL - OK I wouldn't try that pickup either but your idea of switching the other is good.
Bypassing the filter a short time I'm sure didn't do anything, have you dumped the filter into something to check if its picking up any trash??

The Yamaha's do seem to have issues with the VST filter, as they mentioned on THT, you would be only one more of thousands. Frankly based on other THT posts that is probably the issue on the motor, sure sounds like all the others. I think they can be cleaned and see if the yami guys can help you re-use the O ring too - both filter and O ring are $30 ea. Do a search over there and on Florida sportsman - boating. I think FS gives better info.

We have to have the motor running though - I don't think you even have an anti syphon valve - the vent seems good - I would blow back through the fuel line, that will clear any debris on the pickup at least for awhile to check it. If the tank has that much stuff in it you should find stuff in the filter too.

first thing now would be do the VST and get it running on the 6 gal tank with no filter - that bulb might just have been bad though, I have never seen one suck flat though and its not the vent- not the anti syphon - at least we're elminating some stuff - down to pickup and filter on the boatside. I'll do a search on FS and see if I can come up with anything

Ok did the search - good grief they have filters - here is just one that a guy is doing himself and seems helpful - I just did a search for VST filter in boating forum and and bunch comes up - you should probably do it yourself as there is too much.

http://outdoorsbest.zeroforum.com/zerothread?id=788906

[castalot]

this may seen stupid but you are using new gas not gas that has been sitting any time when i bought my boat it came with 80 gals of old gas that would run the engines good until they fully warmed up then they would "bog" down to about 1200rpm and they would't come back until next test day refilled with new fuel and a good dose of startron and all is well good luck

[gofastsandman]

My pickup looked just like yours. It`s a welded threaded collar. I too was afraid. Use a little penetrating oil overnight. Mine backed out pretty easily after I put a little muscle to it. Don`t forget the anti-sieze. They should of used it when made and they look scary, but mine came right out. The other pickup is for twins.
VST`s are notorious on Yamis
GFS

[BigLew]

'01 engines weren't made for ethanol fuels, or at least I don't think they were. Talk to your mechanic friend who has experience with current fuel problems. You might be able to head off a more serious service bill now, while it is still running to some degree.

[eggsuckindog]

My pickup looked just like yours. It`s a welded threaded collar. I too was afraid. Use a little penetrating oil overnight. Mine backed out pretty easily after I put a little muscle to it. Don`t forget the anti-sieze. They should of used it when made and they look scary, but mine came right out. The other pickup is for twins.
VST`s are notorious on Yamis
GFS

I'm not sure I would be bothered with it and just use the other one if that might be an issue, although I don't think thats it anyway.

Sandy what happened with the boat guy - I saw a comment by him but no details

[gofastsandman]

Sandy what happened with the boat guy - I saw a comment by him but no details

[/QUOTE]

32 ft cat vs small lawn.