Where is the fuel pressure regulator on my C70 convertible?

ITSv40 · Jun 18th, 2021, 21:56

According to Haynes: pre ME7 have a fuel pressure regulator attached to the fuel rail. ME7 - which yours is - has a fuel pressure damper. This is located under the fuel rail between no1 and no2 cylinder injector, it is a little round disc that clips into the fuel rail in the same manner as the injectors.

To replace: remove the fuel rail, complete with the injectors, from the manifold and then remove the damper from the rail.

I take no responsibility for the accuracy of Haynes, but hope this helps.

PNuT · Jun 19th, 2021, 05:28

That is a damper rather than the regulator, they fitted those on the fuel rail around 97 onwards and moved the regulator to the fuel line near the steering rack and used a vacuum feed line that ran along the water pipe at the rear of the block.

ITSv40 · Jun 19th, 2021, 08:45

Quote:

Originally Posted by ITSv40

According to Haynes: pre ME7 have a fuel pressure regulator attached to the fuel rail. ME7 - which yours is - has a fuel pressure damper. This is located under the fuel rail between no1 and no2 cylinder injector, it is a little round disc that clips into the fuel rail in the same manner as the injectors.

To replace: remove the fuel rail, complete with the injectors, from the manifold and then remove the damper from the rail.

I take no responsibility for the accuracy of Haynes, but hope this helps.

I have just had a look at the fuel rail on mine. There is nothing attached to it apart from the injectors and the fuel pipe going straight into the rail between no1 and 2 injectors and a shraeder valve on the end by no 5. No regulator or damper, so the above can be ignored. I cannot see down back of the engine to see the regulator that Pnut mentions. I would need the car up on the lift to see underneath and my son's car is on that at the moment - so not much help I'm afraid.

PNuT · Jun 19th, 2021, 09:31

I have had a look at my Me7 car and can not see a FPR anywhere!

Luxobarge · Jun 20th, 2021, 08:43

OK, so there's a fair bit of guessing going on here. Rather than worrying about the FPR location right now, why not get a fuel pressure guage and see what the pressure actually is on the rail in a no-start condition - that way you know for sure whether you have a fuel pressure issue or not - my guess would be not, but I'd recommend diagnostics rather than throwing parts at it. Shocking that the local garage you're using hasn't done this, sounds like they are also guessing! Similarly, it's not uncommon for this type of fault to be caused by the coolant temperature sensor, but rather than immediately replacing it I'd have recommended simply monitoring the voltage on it to see if it's what would be expected when hot and cold - you could still do this even though you've replaced it, as new ones are not always perfect, especially if it's an aftermarket one. The idea of using a decent OBD scanner to see what's going on is a good one too - proper diagnostics, which any decent garage should be doing in the first place.

All this just my humble opinion mind you......

PNuT · Jun 20th, 2021, 16:52

Quote:

Originally Posted by Luxobarge

All this just my humble opinion mind you......

I suspect it is highly unlikely to be fuel pressure related.

crank cam temp sensors......

CNGBiFuel · Jun 22nd, 2021, 17:56

I can confirm that my 1999 V70 has a fuel-rail with a diaphragm to it, I assume this deals with vaporisation, rather than pressure, however, don't take that for fact?
Yes, too much guessing here. I'd be diagnosing the fault for sure before random part-swapping.

Pix of mine...

Baffler · Jun 24th, 2021, 22:38

Quote:

Originally Posted by PNuT

I suspect it is highly unlikely to be fuel pressure related.

crank cam temp sensors......

My money's on the antenna ring connections...they're in fashion this month

PNuT · Jun 25th, 2021, 17:02

Quote:

Originally Posted by Baffler

My money's on the antenna ring connections...they're in fashion this month

immobiliser should fire then stall..... although ME7 may differ ?

Dusty Miller · Jun 28th, 2021, 21:46

Turns out the OBD scanner came up with no engine revolution data. Engine check light has never been on. Replaced crankshaft sensor. Engine started but two miles later it stopped suddenly. OBD said the same thing again. So replaced camshaft sensor. Car started but cut out after a few mins. Local garage suspects connections between sensors and ECU or the ECU. They can do no more and suggest I go to a specialist. That means £50 to get the car transported there and £83 + VAT initial diagnostic check plus any repair costs. Tempted to just get the ECU tested off the car rather than spend more money to find the real problem. It's a nightmare for a car worth less than £2K but what a great car.

Jun 18th, 2021, 21:56	#1
ITSv40 VOC Member Last Online: Today 07:11 Join Date: Mar 2008 Location: Northampton	According to Haynes: pre ME7 have a fuel pressure regulator attached to the fuel rail. ME7 - which yours is - has a fuel pressure damper. This is located under the fuel rail between no1 and no2 cylinder injector, it is a little round disc that clips into the fuel rail in the same manner as the injectors. To replace: remove the fuel rail, complete with the injectors, from the manifold and then remove the damper from the rail. I take no responsibility for the accuracy of Haynes, but hope this helps. __________________ 2001 V40 2.0lt Sport Lux - Daily Driver. 178k miles. 2003 C70 2.4 GT Convertible - Garage Queen. 67k miles. http://www.neptuno6benagil.com

Jun 19th, 2021, 05:28	#2
PNuT MaDMaN Last Online: Nov 26th, 2022 18:47 Join Date: Sep 2006 Location: Red Lodge	That is a damper rather than the regulator, they fitted those on the fuel rail around 97 onwards and moved the regulator to the fuel line near the steering rack and used a vacuum feed line that ran along the water pipe at the rear of the block. __________________

Jun 19th, 2021, 09:31	#4
PNuT MaDMaN Last Online: Nov 26th, 2022 18:47 Join Date: Sep 2006 Location: Red Lodge	I have had a look at my Me7 car and can not see a FPR anywhere! __________________

Jun 20th, 2021, 08:43	#5
Luxobarge Premier Member Last Online: Today 10:53 Join Date: Jan 2011 Location: Horne (Nr. Horley)	OK, so there's a fair bit of guessing going on here. Rather than worrying about the FPR location right now, why not get a fuel pressure guage and see what the pressure actually is on the rail in a no-start condition - that way you know for sure whether you have a fuel pressure issue or not - my guess would be not, but I'd recommend diagnostics rather than throwing parts at it. Shocking that the local garage you're using hasn't done this, sounds like they are also guessing! Similarly, it's not uncommon for this type of fault to be caused by the coolant temperature sensor, but rather than immediately replacing it I'd have recommended simply monitoring the voltage on it to see if it's what would be expected when hot and cold - you could still do this even though you've replaced it, as new ones are not always perfect, especially if it's an aftermarket one. The idea of using a decent OBD scanner to see what's going on is a good one too - proper diagnostics, which any decent garage should be doing in the first place. All this just my humble opinion mind you...... __________________ Some people are like Slinkies, they serve no useful purpose but they still bring a smile to your face when you push them downstairs.

Jun 28th, 2021, 21:46	#10
Dusty Miller New Member Last Online: Apr 20th, 2024 11:34 Join Date: Apr 2011 Location: Lincoln	Turns out the OBD scanner came up with no engine revolution data. Engine check light has never been on. Replaced crankshaft sensor. Engine started but two miles later it stopped suddenly. OBD said the same thing again. So replaced camshaft sensor. Car started but cut out after a few mins. Local garage suspects connections between sensors and ECU or the ECU. They can do no more and suggest I go to a specialist. That means £50 to get the car transported there and £83 + VAT initial diagnostic check plus any repair costs. Tempted to just get the ECU tested off the car rather than spend more money to find the real problem. It's a nightmare for a car worth less than £2K but what a great car.

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