The anti-siphon - is it the fuel pickup y'all are referring to? I've had the flattened bulb sporadically almost as long as I have had the boat. At least 4 or 5 times. Each time I remove the fuel line from the H2O separator that runs to the tank and blow back into the tank to clear it.

I've always suspected trash and gunk in there but there's no sign of anything whatsoever in my fileter(s). So could it be as simple as the fitting getting stuck rather than trash in the lines? As a side note, I need to replace all of my hoses as well. I may get to it this winter, hopefully.

the anti siphon valve is made into the hose barb fitting on the top of your tank, remove the hose barb and look thru it, you will see a check ball, spring and collar. I can't legally tell you what to do with it, But i've float tested them in the past, if it floats in water, its probably good(:zip:), I've taken a Phillips screw drive and punched the check ball, spring and collar out, just to see they were there :zip:

you should probably get some one to open it up and clean it out.
I know these guys are out of houma but they do good work and a fair price.

H & P Sheet Metal Works
1138 Barrow St, Houma, LA 70360
52.0MI from New Orleans
(985) 868-2761

for someone closer try calling Metro Boating to see who they deal with for their aluminum fab work. They probably know someone in the area. If I remember correctly they would bring a lot of their repair work to Jefferson Fiberglass. I don't remember if they did aluminum work in addition to glass work or not.

Metro boating
3028 4th Street
Harvey, LA 70058-2828
(504) 341-4852

If you take the tank out your self I don't see anyone charging over 2 hours to do the job including pressure testing it.

Sounds like I may need to do a float test on mine. :zip:

Sounds like good info to me on the check valve float test.

Not to derail too badly. Cterrebonne, what is the name of the 30 to 40 foot aluminum center consoles that I have seen in your neck of the woods? They remind me of big Fiberglass boats like the Contenders, the workmanship is awesome.

you must be talking about the Gravois Hulls.They are very nice and built solid. I know a local guy that sold a contender to buy the Gravois.

http://www.facebook.com/group.php?gi...2745784&v=wall

then there is another smaller co with really good lines "Gaubert Boat Co." i believe.

That is the one. Gravois, I read their Info section they are only building patrol boats and such. Not much info on them. First glance at one and you would swear it was a fiberglass boat. Awesome, and thank you.

The verdict is in.

My tank is 40 gallons. I emptied 17 gallons of fluid from the tank. 3 gallons of which was salt water. That would explain the surging. My tank vent is at the extreme stbd quarter of the boat at the transom, just below the rub rail and in front of the bilge pump outlet. I think that between the bilge and the spray from running on plane, I shoved a bunch of bayou water down the vent pipe and voila, problem. There was also a bunch of varnishy goodness in the bottom of the tank that I was able to hoover out. I blew the pickup tube out with compressed air; it was clean. I've already replaced all fuel lines with the good stuff prior to this problem and there is no pickup screen on the pickup tube, nor do I have an anti siphon valve.

My plan is to move the vent line on Friday and run it again on Saturday with a clean tank and see what happens.

Shrek, I think you got your basic issue w/the location of the vent fitting...that's absolutely the last place to put an air intake...no wonder it had water in the tank...our V20s vents on some models are poorly located...I repositioned mine ABOVE the rub rail and never had another problem...

glad to hear that that tank is ok and you just need to reroute the vent. let us know how it works.