Fuel tank venting question.
Posted: Tue Aug 14, 2018 9:31 am
2008 21' ST PB, NV Strakes, 90HP Merc
I have some question regarding fuel tank venting on my boat. Back when I bought the boat in 2012, it had stock fuel tank venting which consisted of what appears to be a vented gas gap. The tank is normally surround by water. But the cap sits upon a tall neck out of the water and can certainly can become wet from water splashing, but it does not appear to ever become submerged.
So when I took the boat into the dealer for a fuel starvation problem, in addition to replace the VST float switch, they made a venting mod too. They drilled and threaded in a 3/8"h metal nipple into the metal plate atop the tank, and hooked a long rubber hose to it, and ran it up my taowbar as to be out of the water. It then looped over as to not catch water. So now the tank is vented to atmosphere with NO filtering mechanism in the hose, to prevent moisture from entering the tank.
I am now getting ready to install the third VST float switch on the Merc and I am wondering if this could be related to the mod mentioned. I would hope that they did this at the direction of ST, if it were really needed. Maybe someone can confirm? So last weekend, I removed the hole and plugged the nipple and returned to the stock venting through the air restricted fuel cap, mainly for the Hell of it.
So what do you guys think? Should I stick with the stock gas cap venting? Or re-install the modded vent that the dealer did?
Thanks
I have some question regarding fuel tank venting on my boat. Back when I bought the boat in 2012, it had stock fuel tank venting which consisted of what appears to be a vented gas gap. The tank is normally surround by water. But the cap sits upon a tall neck out of the water and can certainly can become wet from water splashing, but it does not appear to ever become submerged.
So when I took the boat into the dealer for a fuel starvation problem, in addition to replace the VST float switch, they made a venting mod too. They drilled and threaded in a 3/8"h metal nipple into the metal plate atop the tank, and hooked a long rubber hose to it, and ran it up my taowbar as to be out of the water. It then looped over as to not catch water. So now the tank is vented to atmosphere with NO filtering mechanism in the hose, to prevent moisture from entering the tank.
I am now getting ready to install the third VST float switch on the Merc and I am wondering if this could be related to the mod mentioned. I would hope that they did this at the direction of ST, if it were really needed. Maybe someone can confirm? So last weekend, I removed the hole and plugged the nipple and returned to the stock venting through the air restricted fuel cap, mainly for the Hell of it.
So what do you guys think? Should I stick with the stock gas cap venting? Or re-install the modded vent that the dealer did?
Thanks