New to the site, looking forward, lots of valueable info. Should there be negative preasure in the fuel tank when I take the fuel cap off. Physic's say harder to pull the fuel to the pump. book says cap is non venting, I don't get it.

 

check the top of your fuel tank{ where all your plumbing goes in
} for a red or black cap still on the vent. Mine still had it in place and it was causing a vaccum in the tank. There is more info on this site just do a search if you need more info. Welcome to the site! It would help alot if you fill in your sig so we know what year,model,mods.