I guess the worst result would be to have a crud'd up carb and perfectly clean filters.
A few thoughts, not really a diagnoses of what is happening. Modern gas is a cocktail of gasoline, ethanol, detergents, maybe fuel injector cleaners, co-solvents and whatever seasonal additives our government feels should be added. Even diesel fuel is getting to be an engineered blend. With intermittent use the various properties of the fuel can keep particulates in suspension, at least while it is still wet. On a warm day against a warm engine the fuel in the carb will evaporate slowly, leaving behind heavier additives and crud. Repeat a few times a week and after a while you end up with crud / film / varnish in the carb. No perfect solution, a sub 10 micron filter will help. Not having all the extra additives in the gas would be good, not likely to happen. Avoiding ethanol is important, but at least in Canada that means using high test / premium / expensive which has all the other additives. The failure of the exhaust riser and not starting may be related. No guess as to how, particularly if clearing crud out of the carb solved it. Some simple maintenance steps. Get to a clean state, may require having the carb rebuilt. Check the filters and sediment bowl for contaminates. Not sure which carb you have. On mine there is a stern facing drain plug at the bottom, uses a 1/2" wrench. You can drain the fuel bowl into a can, and using the priming bail on the pump you can flush it. Pass the fuel through a coffee filter, then let it dry. You may end up with a light outline of a ring, which is OK. Anything that resembles a psychiatrists rorschach test is likely a problem. I drain everything in the fall, tank - lines - filter - carb. Takes about 15 minutes, plus the time for the tank to drain. In the spring I flush a bit of the gas through the system and the carb using the primer on the pump, again a few minutes. Ends up as part of the oil change, coolant drain and fogging the engine routine. It gets cold enough here that the stability of the gasoline / ethanol / alcohol summer blend may not sit well over the winter. Even the pro ethanol group cautions about the various problems separated or water infiltrated fuel posses. Quoted: There are a few potential nuances that may occur with the initial introduction of methanol blends into the gasoline distribution system. One is that the solvency of the gasoline may now be slightly different from before. This change in solvency may cause some of the long–term gum and dirt build-up in the storage system to readily dissolve, and then be released abruptly from the walls of the gasoline distribution system. As a result, a slight colouration may be found in the initial gasoline batch containing methanol, and a temporary increase in fuel filter replacements may be required at the gasoline dispenser pumps to capture any dislodged dirt. In addition, the pump dispenser filters many need to be switched to a type with smaller micron opening that is designed for alcohol gasoline blends. The performance of vehicles during this initial phase should be unaffected as long as good house–keeping practices are maintained at the retail gasoline outlets. http://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&ved=0CE8QFjAF&url=http%3A%2F%2Fmethanol.org%2FEnergy%2FTransportation-Fuel%2FFuel-Blending-Guidelines%2FBlending-Handling-Bulletin-(Final).aspx&ei=-Z0aU5KWFoTgrQGD0YG4Cg&usg=AFQjCNHeRBwrSRbrOQjrtR_ZApgL_7dlMQ&bvm=bv.62578216,d.aWM&cad=rja Shouldn't be this complicated, just nowhere to go and purchase simple gas anymore. Michael Brown Windburn C&C 30-1 Date: Fri, 7 Mar 2014 20:35:47 -0500 From: "bobmor99 ." <bobmo...@gmail.com> To: cnc-list@cnc-list.com Subject: Re: Stus-List Exhaust Riser Replacement Message-ID: <CAM7ccYKWY=n3dyogbwfbeuvjnvxieg7bwbu9rjpzc_qfov+...@mail.gmail.com> Content-Type: text/plain; charset="iso-8859-1" Michael, Thank you very much for the reply. I hope the rest of the list will indulge in an A4 discussion. Yes, there's a mechanical fuel pump. The stainless sedimenter bowl was "squeaky clean", no crud. The transparent (automotive) gas filter just in front of the sedimenter bowl was/is also "squeaky clean". There is also a canister filter adjacent to the gas tank. I have not had that apart. I've been "pretty good" about using ethanol-free gas and the gas tank has been full throughout the winter. The failure to (re)start coincides with the exhaust riser failure which was noticed at the dock while running the engine after an oil change. Any elaboration of alternate theories is appreciated in advance. Bob M Ox 33-1 Jax, FL
_______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com
