The fuel rail on my SD1 EFI doesn't hold pressure. It drops back to zero immediately the pump stops. it has an after market pump and regulator - the regulator an expensive nor rising rate adjustable type. I take it a one a valve in one of them is either missing or faulty.
It runs just fine, though, but takes a bit longer to start. Does anyone make external ones I could fit to the fuel rail?
Fuel rail
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Re: Fuel rail
Are you sure it's not a leaky injector, or 9th (cold start) injector?
Chris.
Chris.
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Series IIA 4.6 V8
R/R P38 4.6 V8
R/R L405 4.4 SDV8
Series IIA 4.6 V8
R/R P38 4.6 V8
R/R L405 4.4 SDV8
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Re: Fuel rail
DaveEFI wrote: ↑Fri Jul 24, 2020 8:32 amThe fuel rail on my SD1 EFI doesn't hold pressure. It drops back to zero immediately the pump stops. it has an after market pump and regulator - the regulator an expensive nor rising rate adjustable type. I take it a one a valve in one of them is either missing or faulty.
It runs just fine, though, but takes a bit longer to start. Does anyone make external ones I could fit to the fuel rail?
You need to establish which isnt holding first. But I never had a problem starting with a setup that lost pressure. Although a setup that does hold may start a small fraction quicker.
What pump and reg is it ?
Re: Fuel rail
The pump is an unbranded substitute for the original Bosch - a direct replacement, and has given good service. The reg is a Malpassi adjustable but non rising rate.
Dave
London SW
Rover SD1 VDP EFI
MegaSquirt2 V3
EDIS8
Tech Edge 2Y
London SW
Rover SD1 VDP EFI
MegaSquirt2 V3
EDIS8
Tech Edge 2Y
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Re: Fuel rail
And does the Bosch have the non return valve fitting on it's discharge ?
Or what type of fitting is it ? The likes of 044's are an M12 thread, but they come with an adapter with a NRV in it, although any time I use them I remove it as it restricts flow a little.
Not sure if the pumps with say a barb hose tail on them would have a NRV inside....probably not.
Or what type of fitting is it ? The likes of 044's are an M12 thread, but they come with an adapter with a NRV in it, although any time I use them I remove it as it restricts flow a little.
Not sure if the pumps with say a barb hose tail on them would have a NRV inside....probably not.
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Re: Fuel rail
I have a similar setup and it behaves the same, always thought it was odd but doesn’t give any issues so not bothered to investigate further. I had to remove the Bosch pump a few years ago as it failed, don’t know if that behaved any different as I never measured the pressure with that pump, fitted a Sytec at that point. Don’t know if there is a separate one way valve in the standard system or if that is in the pump