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850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
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Help fuel supply question suspect regulator?Views : 581 Replies : 7Users Viewing This Thread : |
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Apr 2nd, 2024, 21:31 | #1 |
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Last Online: Apr 7th, 2024 21:49
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Location: Hull
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Help fuel supply question suspect regulator?
Hi I need to once again as you all for your advice.
The car broke down the other day with the AA recovery person advising it was a fuel pump issue. Sure enough I had power to the pump terminals and I could not hear the pump prime, so order and fitted a new pump and still the car will not start. Whats odd is that under the bonnet I have zero fuel pressure at the Schraider valve, and the pump definitely primes then stops. When I slacken the lock nut off on what I think is the return on the fuel rail I have zero pressure or fuel, however there is plenty of pressure going into the fuel pressure regulator on what I suspect is the supply from the pump/filter. Please can anyone advise what have I missed or what can I try? Regards Nigel |
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Apr 2nd, 2024, 22:31 | #2 |
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Last Online: Today 10:03
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Location: Corsham , Wiltshire .
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I should replace the fuel filter as a start. I had one block on my old V70 and the symptoms were similar to what you're experiencing. I cut the old one open and found the innards had collapsed and blocked the outlet .
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Apr 4th, 2024, 22:01 | #3 | |
mad mechanic
Last Online: May 11th, 2024 21:17
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Apr 5th, 2024, 23:21 | #4 |
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Last Online: Apr 7th, 2024 21:49
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Location: Hull
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Checked tonight and have 90psi at the pipe going into the fuel pressure regulator but zero pressure in the actual fuel rail, surely this is pointing to a failure of the pressure regulator rather than the fuel relay as there is no fuel in the rail to be injected and to the best of my knowledge the relays fires the injectors, the pressure regulator has no electrical connection or link to the fuel injection relay. Totally appreciate any suggestions and clearly I don’t know what I am doing hence the question.
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Apr 5th, 2024, 23:27 | #5 |
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Last Online: Yesterday 12:32
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Location: Manchester
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check the cam position sensor i believe it sends pulses to the fuel system
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Apr 6th, 2024, 08:28 | #6 | |
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Apr 6th, 2024, 22:40 | #7 |
Junior Member
Last Online: Today 10:03
Join Date: Apr 2010
Location: Corsham , Wiltshire .
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I agree with luxobarge . Definitely sounds like the regulator . They are fairly cheap to buy on fleabay , worth a try
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Apr 23rd, 2024, 14:05 | #8 |
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Last Online: May 10th, 2024 19:48
Join Date: Dec 2002
Location: Tiverton
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nigellazypostman was it the FPR? I would be interested to know if a normally reliable piece of kit failed in your instance.
Cheers. |
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