Discovery 1 95 model FPR hose

hi_arshard · Jan 16, 2024

Car : Discovery 1 3.9L V8i
What happened if the fuel pressure regulator vacuum hose is removed? I noticed FPR vacc hose is missing.

discool · Jan 16, 2024

Well what it does, it ensures that fuel rail pressure is maintained at a constant pressure difference of 2.5bar above that of the manifold. When pressure exceeds the regulator setting excess fuel is returned to the fuel tank.

So it seems that isn't happing so replace the hose.

hi_arshard · Jan 16, 2024

hi_arshard said:
Car : Discovery 1 3.9L V8i
What happened if the fuel pressure regulator vacuum hose is removed? I noticed FPR vacc hose is missing.

discool said:
Well what it does, it ensures that fuel rail pressure is maintained at a constant pressure difference of 2.5bar above that of the manifold. When pressure exceeds the regulator setting excess fuel is returned to the fuel tank.

So it seems that isn't happing so replace the hose.

Great… thanks. I had black smoke and engine not producing enough power is it becoz of this ?

discool · Jan 16, 2024

Ok, black smoke coming out of the exhaust tail pipe is a good sign of over fuelling.
Hopefully it will then be back to as it should be with the pedal to the metal acceleration.

hi_arshard · Jan 16, 2024

Will try that out and update you here. Thank you

Discovery 1 95 model FPR hose

hi_arshard

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discool

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hi_arshard

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discool

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hi_arshard

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