![]() ![]() The foul muck that results will quickly clog fuel filters and stop engines. Ethanol on its own is harmless, but left in a tank with any amount of water moisture will create a huge mess.ĭiesel is prone to algae and growth in the tank if moisture is introduced and left too long. Entire books could be written about this problem, but suffice to say that avoiding ethanol is to every boater’s benefit. Gasoline problems usually stem from ethanol fuel. Gasoline and diesel both have their demons that you must be careful to avoid. It helps to fuel slowly and carefully, but sometimes you have to be ready with a fuel absorbent mat – just in case! When you aren’t expecting it, it can make a real mess. The most common problem during fueling is having gas spewed out the hull vent or fill hose. The fuel pump will likely shut off prematurely if the only escape path is through the filler neck. If you pour a liquid into the tank, the air from the tank needs an escape path. Of course, vents are also crucial during the fueling process. ![]() Once the force of that suction exceeds the pull of your fuel pump, fuel will no longer flow, and the engine will stop. If that’s the case, fuel may flow to the engine for a short time until a suction or vacuum forms inside the tank. Eventually, the liquid will stop flowing out.įor this example, a fuel tank has no vent or perhaps has a blocked fuel vent. If there is no way to allow air into the tank, the lowering fluid level will create suction. If a tank is sealed, and you pull the liquid out for use, something has to be added back. A vent line allows air in and out of a tank. Most fuel pumps put the good stuff faster than our engines use it, so any problems with the vent show their heads first there.īefore we dive in and look at fuel tank venting problems, let’s take a minute and reflect on why vents are so important in the first place. Problems nearly always occur during fueling at the gas pump. One of the most common problems is with the boat fuel tank vent. How Do You Know if You’ve Got Boat Gas Tank Vent Problems?
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