Range Rover no start

[aaronfox rover]

We have a problem with my 97 Range Rover 4.0. The old fuel pump wouldnt pump up but 10 psi. We changed it out. Now the new pump with key on will pump to 35 psi, it will start but the fuel pressure just bleeds off to nothing after it starts and then it dies. Any suggestions?

 

[fanatic]

fuel pressure reg if the supply is still to pump at a guess

 

[jamesmartin]

is there still 12v at pump after starting

 

[aaronfox rover]

will check the 12 volt, if it doesnt have 12 volts what do you suggest?

 

[aaronfox rover]

is the fuel pump ran off of the oil pressure switch after start?

 

[aaronfox rover]

yes 12 volts to the pump even after start up. The new pump will pump up to 35 psi then bleed back off after about 3-5 sec. We can get it started but will only idle and pump will maintain about 10 psibut usually dies again after about 2 minutes.

 

[aaronfox rover]

is there still 12v at pump after starting

yes still 12 v at the pump after it starts but it doesnt pump up any preeeusre, un less im checking the wrong wires