I have a problem that has been on going for some time. My 1998 TDI takes 5 or more turns to start up. Had it in a shop, checked the injection pump, all was fine, did a pressure check, replaced injector, checked the fuel pump, did electrical check, and etc. Found nothing wrong. Even had a so called expert from VW come in. It has 156,000 miles, just breaking in. Is there some sort of fuel shutoff solonoid that could be the problem? Its seems to take longer starting when the engine is hot. Help.