A friend just posted this on the wrong forum. (fishing forum) Here's his question. I'll post a link to here on that forum so he can view the answers. I've always come here for motor problems. He's a bit of a clown in the way he posted this but here it is.
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Let's say that some guy, his name is not important, buys a walleye style boat with a few years on it, but the overall hours of engine use are relatively low. After taking the boat out on local waters, the main outboard, for the sake of argument, let's call it a Merc 115, develops an intermittent fuel delivery problem wherein the bottom carburetor seems to malfunction in some way and the bottom two cylinders (of six) does not get enough fuel to run properly.
While taking excess "stuff" out of said boat, the owner notices that the rubber fuel hose that attaches to the pickup tube of the gas tank has a couple of issues: specifically, (1) the end of the rubber hose looks kinda frazzled and funky (2) the hose is barely over the barb of the tank outflow tube and (3)there is NO clamp on the end of the hose. One other interesting piece of data is that this is probably the original 21 year old hose that came on the boat when it was new.
Is there even a small chance that this combination of potential problems would be enough to cause the fuel pump to lose a considerable amount of vacuum , thus decreasing the total volume of fuel enough to cause starvation to at least one of the carbs? I ask this question because I installed a clear glass inline fuel filter on the NEW fuel line back inside the splash well. I began to have suspicions when I held the line in a vertical position and pumped the bulb. A whole slew of tiny little air bubbles shot through the filter from the gas tank side. The tank is 3/4 full, and it ain't got no stinkin' bubbles in it, so where else could they be coming from?
The entire gas line system is getting an overhaul tomorrow while it is raining hard all day. So far, the local marine shop has hit me for over five hundred bucks in "fixing the fuel problem". If six feet of new fuel line does the trick, somebody is gonna hear some ugly words.
First order of business is to bypass that old original line and run a piece through the hole at the top of the splashwell where it should have been in the first place. That double male adapter that goes through the splashwell wall is just two more places to eventuall leak air. Second order of business is to figure out how to put both motors on a single pump bulb, eliminating one tee connector and two more places for air to leak. Will let you guys know how this turns out, and if it does, which shop to stay away from.
xxxxx
Let's say that some guy, his name is not important, buys a walleye style boat with a few years on it, but the overall hours of engine use are relatively low. After taking the boat out on local waters, the main outboard, for the sake of argument, let's call it a Merc 115, develops an intermittent fuel delivery problem wherein the bottom carburetor seems to malfunction in some way and the bottom two cylinders (of six) does not get enough fuel to run properly.
While taking excess "stuff" out of said boat, the owner notices that the rubber fuel hose that attaches to the pickup tube of the gas tank has a couple of issues: specifically, (1) the end of the rubber hose looks kinda frazzled and funky (2) the hose is barely over the barb of the tank outflow tube and (3)there is NO clamp on the end of the hose. One other interesting piece of data is that this is probably the original 21 year old hose that came on the boat when it was new.
Is there even a small chance that this combination of potential problems would be enough to cause the fuel pump to lose a considerable amount of vacuum , thus decreasing the total volume of fuel enough to cause starvation to at least one of the carbs? I ask this question because I installed a clear glass inline fuel filter on the NEW fuel line back inside the splash well. I began to have suspicions when I held the line in a vertical position and pumped the bulb. A whole slew of tiny little air bubbles shot through the filter from the gas tank side. The tank is 3/4 full, and it ain't got no stinkin' bubbles in it, so where else could they be coming from?
The entire gas line system is getting an overhaul tomorrow while it is raining hard all day. So far, the local marine shop has hit me for over five hundred bucks in "fixing the fuel problem". If six feet of new fuel line does the trick, somebody is gonna hear some ugly words.
First order of business is to bypass that old original line and run a piece through the hole at the top of the splashwell where it should have been in the first place. That double male adapter that goes through the splashwell wall is just two more places to eventuall leak air. Second order of business is to figure out how to put both motors on a single pump bulb, eliminating one tee connector and two more places for air to leak. Will let you guys know how this turns out, and if it does, which shop to stay away from.