Just had a fuel pressure test done and its reading 35psi on idle and 50psi when accelerated, I know it should be 43 psi on idle. Before it goes on the RR, would it be a good idea to upgrade the fuel pump? Would I need to upgrade the fuel regulator to an adjustable one?

Its probably your fuel regulator, I would replace it with a new OEM one.

 

Did you try it with the vacumn feed unplugged from the Regulator as well ?

Edited August 28, 200916 yr by Yowser

Its probably your fuel regulator, I would replace it with a new OEM one.

 

Did you try it with the vacumn feed unplugged from the Regulator as well ?

 

Im not sure what they done, do you think the pump is ok as i will be upping the boost soon will hoping it will be around 450 hp at wheels with the mods ive got.

Could this be the cause of the hesitating when cold and smell of petrol i get also when cold?

Its probably your fuel regulator, I would replace it with a new OEM one.

 

Did you try it with the vacumn feed unplugged from the Regulator as well ?

 

Yes but made no difference, could it be regualator or pump, the pump aint making no weird noises.

Just had a fuel pressure test done and its reading 35psi on idle and 50psi when accelerated, I know it should be 43 psi on idle. Before it goes on the RR, would it be a good idea to upgrade the fuel pump? Would I need to upgrade the fuel regulator to an adjustable one?

Im sure the figure is around 37 on idle.So yours is working as it should.With the gauge connected pull the vac pipe and it should climb to 43.Under boost you should see 43 plus what ever your boost pressure is iirc.

Im sure the figure is around 37 on idle.So yours is working as it should.With the gauge connected pull the vac pipe and it should climb to 43.Under boost you should see 43 plus what ever your boost pressure is iirc.

 

what about if u runing 550 cc still same figures ??

if there is no affect with disconnecting the vacumn feed to the regulator then I would suspect a regulator issue.

 

Jimmer is right though, its 36.3 with vacumn connected to regulator and rising to 43.3 with regulator disconnected. Each psi of boost should raise fuel pressure an equal amount under full load.

Edited August 31, 200916 yr by Yowser

what about if u runing 550 cc still same figures ??

 

Injector size has no affect.

Injector size has no affect.

 

is that with oem regulator ??

Would the OEM regulator and pump be sufficient at 450whp?

Would the OEM regulator and pump be sufficient at 450whp?

 

yes, your well within the stock pump limits

Should I replace the regulator? How much are they?