VN fuel pressure regulator

[Not_An_Abba_Fan]

I'd also look at the fuel pump. Crimping off the return line boosts pressure in the fuel rail so maybe the pump is on its way out and doesn't pressurize the system enough.

 

[85commolux]

This might sound silly but could it have anything to do with the length of rubber hose I have used. This problem has only come on since I turned the tank around and now I have 1.2 m of high pressure hose running to my steel line.

 

[Not_An_Abba_Fan]

If it is proper high pressure EFI fuel hose, it shouldn't matter. Unless it is a larger diameter than the steel line, then I think it will lose pressure.

 

[85commolux]

No its 5/16" premium EFI hose.

 

[Not_An_Abba_Fan]

Could be just coincidence.

The pump hasn't been run dry?

Just had another thought, the vacuum hose off the regulator is connected directly to manifold vacuum isn't it?

 

[85commolux]

Yep. It goes to the elbow

 

[Not_An_Abba_Fan]

Do you have a fuel pressure gauge?

 

[FXST01]

Are you still using the Hilux fuel tank?
If you are then most likely still using the Hilux fuel pump as well, what pressure does the hilux fuel pump go to?

The VP fuel pump at idle should be 250 ± 10 kPa

 

[85commolux]

No I have actually mounted a 75 lt tank from a Jeep Cherokee in the back with the Jeep fuel pump which runs a 4.0l I6.

 

[Not_An_Abba_Fan]

Have you ever had it running?

I'd still try and get fuel pressure gauge and see what pressure your running.

Also, are the return lines hooked up correctly? You maybe in fact sucking the fuel back into the tank if it is hooked up to the wrong fitting on the tank.