[54vicky]

if you needed a bypass check valve etc. you would have read about the need for one it is not like you are the first to install one.first thing you need to do is bypass the electric pump.pretty simple use a short piece of fuel line.if runs like it used to then.now look at fittings used if they have too small a hole then you are choking the fuel supply thus the need for using electric to boost flow somewhat but never getting full flow.think about it if you made no other changes logic dictates fuel pump or fittings are problem.another thing if you used barb fittings the fuel line can sometimes catch on fitting when sliding on causing a partial blockage.you will not know without removing the thing that led to problem.or bury your head and throw money and time at it good luck