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i have a 390 Ally craft with 120mm gunnells and a 40lt underfloor fuel tank, when i go out fishing i rearly use all my fuel, often coming home with at least half a tank of fuel.
but the next time i go to use the boat i find that i'm down to a quater of a tank. this led me to belive that someone was coming into my yard while i was at work during the day and taking some of my fuel.
that is until i noticed that side of the boat often has fuel on it where it has run down the side of it, today i came home and when i looked at the boat it smelt of fuel and i could see it on the gunnels and it was running down the back of the boat off the boat.
what would be causing the fuel to come up out of the fuel tank like this and how can i stop it, as i'm losing up to 10lts between trips, and with fuel the price that it is i cant afford to lose 10lts of fuel while the boat just sits in the yard?
You will need to track back from the motor and think of all the spots where fuel can exit the system from and how they are located relative to where you see it on the gunnels.
Do you disconnect your fuel line from the motor? Is the ball valve there not closing off properly? Is petrol escaping from where the line joins the tank? When you store you boat is the bow pointed towards the sky to aid drainage, but this makes the fuel sit up against the filler cap?
Do you screw your lid down tight for storage or allow the tank to breath. Sounds like maybe the tank is heating up during the day and the expansion is forcing fuel out of the system somewhere. Otherwise start looking at maybe a small puncture or split in the tank.
It can't be setup properly if the breather tube is under the level of the fuel - forcing it up the tube when the air in the tank expands.
Unless, of course, what booty suggested, that you have the bow too high in the air and tilting the tank so that the breather outlet is under the level of the juice.
Only one place the fuel could go in that instance - up the tube and out of the outlet on the back of your boat.
Try tilting the boat less (just enought to drain) and see if you have the same problem.
Hi Brenno, have you got loops or coils near the end of your fuel vent hose. If you coil up the hose about 4 coils and zip tie it up vertical so the fuel remains in the bottom of each coil, it will still allow the fuel tank to vent out the top of the coils and not push to much fuel out either.
(Howcome all fuel vents are at the rear of the tank they should be up the front of the tank.)
Damn fine water trap as well, prevents splashes from your motor getting sucked in the fuel tank.
As others have said it sounds like a breather issue.
At a guess it sits out in the sun.
You have to try and cool the fuel.
Put it in your garage in your normal storage position and see if this helps.
yes it sits in the sun (no garage), but it is under a boat cover, i do disconnect tehe fuel hose from the motor, the fuel vent has only one lop in it an it is under the gunnel next to the intake hose, didn't know i was suppose to lossen the fuel cap, mite explain why it is hard to open when i haven't used it for a few wks.
the boat has a jockey wheel so it sits fairly level, but when i put it out of the way it sits with a lean to the side with the fuel cap on it.
will losen the fuel cap, and leave it sitting straight for a few days and see if that helps, otherwise i mite have to try some of the other things that have been surgested here.
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