Fuel Tank

[jjhjrcmh]

I have a 103 gallon fuel tank with a Moeller pick up tube.The anti siphon valve sometime pick up debris from the tank and clogs up once in a while. . Can I install a filter before the anti siphon valve to trap debris. I have a Evinrude E200TXECM 1998 engine. I was thinking this filter would be easy to clen if something got pulled up. I have a fuel seperator installed but it seems that the check ball doesnt take much to stop it from working. Or would it be better to put the screen back on the pick up tube? On the new tube I bought it does not come with the screen.

 

[Chris1956]

Re: Fuel Tank

A screen upstream of the anti-siphon valve will be hard to clean. Consider siphoning out your fuel and filtering it to remove debris. If it were me I would remove the A-S valve and let the water seperator collect the debris. Be sure to carry a new water seperator with you in case it cloggs....

 

[Home Cookin']

Re: Fuel Tank

does the tube have a screen on it? it should.

Some people like a slanted tip on the tube but if you think about it, it may as well be cut off level at the high end. I also recently heard of someone having problems b/c the bottom of the tank was bowed up, pressing against and blocking the intake, so he shortened it.

I think for some the idea of shortening the pick-up is a good one. Not on a small tank like a 6 gallon, but an in-hull of 60 gallons or more. Realistically you aren't ever going to run it bone dry, and that bottom layer is where the problems lie. In fact, i doubt any tubes go all the way down anyway.

Someone smarter than me could figure the # of gallons in the bottom inch of a tank (based on LxW) and it's probably not significant.

 

[jjhjrcmh]

Re: Fuel Tank

What is the porpuse of the A S valve?

 

[dingbat]

Re: Fuel Tank

Someone smarter than me could figure the # of gallons in the bottom inch of a tank (based on LxW) and it's probably not significant.

With L and W in feet, (L x W) x 0.08 /0.13 = US gallons

In my 94 gallon tank, 1" of fuel on the bottom is roughy 5 US gallons

FWIW: I removed the check valve and the screen out of my tank 4 years ago when I started getting fuel alarms on my 1997. I had intentions of putting the check valve back in but never got there. It's not required on my boat so I doubt it will ever finds its way back in there now

 

[O'Riley]

Re: Fuel Tank

Someone smarter than me could figure the # of gallons in the bottom inch of a tank

http://mathcentral.uregina.ca/volume_calculator

 

[Chris1956]

Re: Fuel Tank

An antisiphon valve seals the fuel line against a siphon action into the bilge. Let's say the a fuel line were to break near the engine. On a I/O this could be lower than the fuel level of the tank and the fuel could pour into the bilge under siphon. The A-S valve is a spring loaded ball, usually in the fuel pickup elbow, that seals the fuel tank. The fuel pump of the motor needs to pull the fuel past the sealing power of the antisiphon valve.

Outboard fuel lines are normally higher than the fuel in the tank, and therefore a siphon action will not occur. Of course if part of the fuel line is lower than the fuel level, and it breaks there....