It's taking ages to start the transporter van I have. As if it was starved of diesel. At first, I thought it was the fuel pump relays, but I bought a couple and swapped these about with no improvement. I noticed that the tank lift pump didn't seem to turn on when the ignition was turned on. I understand that it runs for several seconds. Also, the auxiliary fuel pump doesn't seem to work. I have checked both pumps and both work when 12v is fed to them. This also ruled out the wiring loom. I have also tested the amount of fuel each pump moves, and this seems normal. Also, cracked open an injector just to see if fuel is reaching these and all seems fine. I have bought a ross tech vcds to test and check live reading concerning the fuel system but from what I can see, it's all ok. Originally, I had several fault codes but when cleared, the vcds said that everything was ok with no faults. I am leaning to it being either the fuel stop valve (think this is what it's called) or the ECU. More ECU as the problems with the fuel pumps is a mystery. Any advice welcome. I'm running out of ideas. Thanks.