[Bushwacker]

The vent and pick-up should be much different size fittings! Your fuel pick-up should be on back of tank, since back of tank should sit lower than front, especially if it's a cc boat, since they tend to be a little stern heavy. Should be a brass or stainless elbow threaded into tank; while you're in there, it's worth pulling it to make sure inside passage is at least as big as a fitting for 3/8" dia. fuel hose. (You can fail a powerhead if this fitting restricts fuel flow if you're running pre-mix fuel!) The vent line (which is sized to pass vapor and therefore bigger than fuel pickup) should be about 1/2" or 5/8" diameter and probably welded to tank. It should be on highest point of tank WHEN YOU'RE REFUELING. Sending unit should be in center of tank for most accurate reading. On my Seafari, the fuel fill is at stern on stbd gunnel (fill hose goes into top at rear of tank), so when I'm back there refueling boat in the water, it will list to stbd and be slightly low in the stern. Vent on my tank (still the original tank) is all the way fwd on port side, so it works fine for in-water refueling. If I refuel at a gas station with boat on trailer, the front of tank is lower than stern, and it will overflow before tank is full, so I typically carry 1 or 2 jugs and get gas in them too. Then I top off in water or at home out of jugs with front of trailer raised up. It will typically take at least another 5 gallons if it was full at gas station.