My transit won't start it's got a brand new starter and runs a dream when it has been tow started it will run all day from a tow but as soon as I switch it off it just won't start engine turns over but won't start any iras on what it could be i by past the filter housing thinking it was that but nope still won't start is there a pump in the fuel tank that can be giving me bother I don't think it's the main fuel pump on the engine as once it's started it sounds great no black blue or white smoke from it. But I have bn wrong before thanks in advance