09-02-2012, 09:50 AM
I would agree with seb, sounds like air is getting into the fuel system. If you look from the top of your fuel filter to your fuel pump there should be a fuel line connecting them? If this is a clear pipe you should check it to see if there is any air bubbles in there whilst cranking the engine over. If its not clear then get hold of a clear bit of fuel pipe and replace the bpipe which is currently there so you can check for any air 
Also, try squeezing the hand primer (grenade shaped thing) until is goes hard (count how many aqueezes it takes to get hard.....) and then once its hard keep your hand on it applying firm pressure, and listen out for any hissing/dripping from the fuel system (best to do this when its very quiet, you wont be able to hear anything if you live near a busy road or in the city......)
HTH, Dan.
Also, try squeezing the hand primer (grenade shaped thing) until is goes hard (count how many aqueezes it takes to get hard.....) and then once its hard keep your hand on it applying firm pressure, and listen out for any hissing/dripping from the fuel system (best to do this when its very quiet, you wont be able to hear anything if you live near a busy road or in the city......)
HTH, Dan.