Fueling/Motor problems - would appreciace input - Page 3

mbo_1971 · #21 07-21-2009, 10:25 AM

thanks guys - I will hit the pickup with pb blaster sat am and then give it and the VST a try on sunday (provided I can get a hall pass both days....) Much appreciated.

1bayouboy · #22 07-21-2009, 09:45 PM

I'll be watching this thread.....I have a very similar symptom with a carbed 115 premix yamaha. I replaced the fuel lines from fuel pump to pick up barb, new filter and connector to motor. Still the same.....I just don't understand the intermittent nature of the problem....but whatever yours is I'm going to fix on mine....so good luck!!!

1bayouboy · #23 07-21-2009, 09:47 PM

What is "pb blaster"....???

mbo_1971 · #24 07-22-2009, 10:44 AM

super WD40. penetratrant as GFS suggested. Generally thought of as the best, but have to let it soak for a while for it to work fully.

Bushwacker · #25 07-23-2009, 11:57 PM

The best penetrating oil I've ever found is Aero-Kroil. A co-worker that had a side business overhauling turbochargers swears it's the best and even got Pratt & Whitney to start using it on their development engines. Can order it from Eastwood; some good hardware stores may have it. Can also order direct . . . do a google search for Kroil.

mbo_1971 · #26 08-03-2009, 09:04 AM

Well - finally got a chance to try and give this another shot. After talking to a few people, the suggestion was to change the VST and the inline filter as well. Popped the cowl and started up at the clear bowl in front of the inline and VST. This is where fuel first comes into the motor.

Literally an inch of crud at the bottom of it and, in looking at the panel filter at the top of the bowl, the folds were almost packed with crud. The bowl came off fine, but trying to put it back in was a little tough. I have not had ethanol in the boat for long, but the clear bowl and or the o-ring at the top had already swelled a bit. Good trick i had heard was to throw it in the freezer for a bit. I did so while i worked on the other issues and when it came time to reassemble, it popped right back on. Fortunately a buddy of mine had a new panel filter so i replaced that as well in the process. I would recommend for those doing this maintenance so next was the inline filter. This one is kinda tricky and a bit a pain.

The picture is kinda small (stolen from ESD's thread) and i did not take any pict of our process (unfortunately). The key is the black collar that protrudes from the silver fitting. It along with the inline filter need to be pushed back towards the silver fitting, and with the black collar still pushed back towards the silver fitting, pull the inline away from the fitting and it should release. Its not completely intuitive but once its done you are like, oh, that is what i was supposed to do.

So the VST was last and was probably the easiest. Cracked the screws at the top, released the drain at the bottom and collected the fuel. Unbolted the vapor canister from the head (watch out for those washers!) Cracked the canister (REALLY WATCH ALL THOSE LITTLE SCREWS!) Removed the gasket/o-ring and then the VST. It was not the same semi translucent color (more brown - same color as the gunk in the clear bowl.) VST takes a little thinking, but is overall not bad to pull and replace.

Buttoned everything up and headed up to the fuel pickup. I had hit it with PB Blaster the day before and once it put the wrench on it and tapped the wrench just ever so slightly it spun off with very little resistance. No anti siphon valve in the elbow and no screen at the bottom of the tube. Back in it went with no-seize paste and fuel line back on.

Dunked the boat, putted out of 6knt zone, leaned on her - 1800 RPM, no prob, 2000 RPM no prob, 2200 RPM no prob (this is where she was choking out on me) and up she went....WHEW, what a relief! Ran her for about 45 min and varying speeds and pulled her off plane and put her back on a bunch of times and no issues.

Thanks guys for the suggestions and the moral support on this one. Hoping I have it licked at this point, but will wait to log some longer trips on her before i call it done. Man, dealing with motor issues is a real headache and is really stressful.

Matt

cobiawayne · #27 08-03-2009, 04:29 PM

I just went through allmost the same scenario.My pickup tube had screens in it for a filter I guess,I removed it and it was full of crap.I took a long screwdriver, pushed all the crap out.Put her in the river with a fresh fuel water sep.And a new inline filter by the engine and took 2 extra inlines with me.Had to change 1 inline filter in river and shes running great.

eggsuckindog · #28 08-05-2009, 01:07 AM

Glad it seems to have worked out - I still don't understand the bulb sucking flat though but as long as its running good

mbo_1971 · #29 08-05-2009, 10:40 AM

ESD - the only thing i can come up with is that the 10-micron filter trapped so much crud that it would not pass enough fuel and therefore let the bulb suck flat. Plan is to keep a couple new filters on the boat for a while.

Fr. Frank · #30 08-07-2009, 08:34 AM

ALWAYS carry spare filters. It can mean the difference between spending the night in your own bed or spending the night waiting for the Coasties.