Please help

[tbos325]

i need help tring to figure out starting problem. engine turns over just fine but during cranking it is not getting fuel pressure. i jumped fuel relay fuel pump is fine. i have 3bar fuel pressure and 12 volts to relay. i swaped relay and still no fuel when cranking. but after a couple tries cranking it will start and run just fine. but when i shut down the engine i loose fuel pressure. it bleeds back on pump side.

[jlevie]

The loss of pressure once you shut the engine off is a bad check valve in the pump. That probably means that the pump is worn and needs to be replaced.