Anti-siphon needed?

[chrisrub]

85 V20 with an OMC Sea Drive 1.6 liter. Having a running problem. I isolated the problem down to the main fuel tank. Runs fine on a separate 6 gallon.

I've replaced the fuel lines, filters, primer bulb, fuel pickup and a new anti-siphon fitting. Then I took all the old gas out of the tank that I could and added fresh new gas with some startron.

The 6 gallon doesn't have an anti-siphon fitting on it. Thats the only difference between the two set ups.

Would it be a bad idea to take out the anti-siphon valve on the main tank and just run a straight fitting?