Have no expirence with fuel cell foam and don’t anyone that does. Suggest that you pull the pickup line out of the tank. There should be a weighted end and the line should be flexible. The weighted end should almost reach the bottom of the tank and that should be long enough to pick up fuel when it sloshes to the far side of the tank. Will adding more fuel help?
7 1/2 qt. The pick up is a margay style coming in from the lower rear of the tank. The pick up is located well for a fixed pick up. I can do a wand style pick up from the top as Tony recommends, i have already bought the parts, but was hoping to get some feed back as to which method is best.
Sorry, never considered you might have a bottom pickup. Hopefully someone with a similar tank will post. If you look into the tank, are there walls around the pickup area? If not, would you consider installing a short piece of fuel line with a weighted end?
Sprint enduro racing requires a minimum of 7 quarts for the 30 minutes of racing. With the newer style seat it leaves very little room for a fuel tank. That is why i made one. If i could buy an off the shelf tank that would fit i would have. Problem is when the tank is full and the fuel sloshes it pulls air. Then you have a big bubble in the line. It either stumbles or builds heat or both.
The (Van K?) aluminum tank on my SRR has a small chamber in the back to delay cavitation. If you put a donkey dick in the top use tygon or other non hardening tubing with heavy brass end piece and leave it a good 1-1/4″ off the bottom, it will stretch down and get hung on the bottom.
cell foam will not help. A bottom feed tank needs a sump to trap fuel for the corners. Some builders installed a partition in the tank with a trap door that will allow the fuel to move to the rear during acceleration and trap it there when braking or turning. Others built the sump hanging out the bottom of the tank and have small holes in the floor of the tank that feed the sump. That setup required the floor of the tank to be raised up off the pan of the kart. Using a chaser line from the top is effective as long as the floor of the tank is smooth and has nothing the weighted end can hang up on.
If you have to do any welding on the tank be very careful to clean it well enough to insure there are no remaining hydrocarbons left to explode…. speaking from experience here :(