|
200 Series General Forum for the Volvo 240 and 260 cars |
Information |
|
Fuel pressure regulatorViews : 1302 Replies : 10Users Viewing This Thread : |
|
Thread Tools | Display Modes |
Nov 9th, 2023, 16:59 | #1 |
New Member
Last Online: Feb 8th, 2024 14:01
Join Date: Dec 2009
Location: Market Drayton
|
Fuel pressure regulator
I'm having reliability issues with my 1991 Torslanda (B200F - injection). Symptoms are: from start up everything is fine until I have driven half a mile. Then the engine dies. It doesn't cut out completely straight away, but lacks all power and it's impossible to keep the revs up. Then it dies.
If I wait ten minutes or so it will start but won't idle - I have to keep pumping the throttle. Eventually it seems to burst into life and I can drive away again. A few days ago I replaced the under-car fuel filter. This has made no difference. This is my first Volvo with petrol injection and I have to confess that I don't know much about it. While on the phone to Brookhouse (ordering some unconnected parts) I asked if there was a second fuel filter but he didn't think so (not counting the one in the tank if it's still there). I asked about a metal cylinder about an inch and a half diameter and two inches long on top of the engine towards the front. This unit seems to have petrol coming in (from the under-car pump and filter?) and petrol coming out into the injector pipework. There also seems to be a small diameter (vacuum?) hose connecting to the intake manifold. What is this device? Could it have failed, and would that give the symptoms I have described? To me, everything points to a fuel blockage of some sort. I would be grateful for your thoughts. |
Nov 9th, 2023, 18:26 | #2 | |
Not a junior anymore
Last Online: Yesterday 19:33
Join Date: Nov 2014
Location: Worcester/Droitwich
|
Quote:
|
|
Nov 9th, 2023, 21:20 | #3 |
New Member
Last Online: Feb 8th, 2024 14:01
Join Date: Dec 2009
Location: Market Drayton
|
Thanks timetrip. So... could the fuel pressure regulator being faulty give those symptoms? Is that the likely culprit?
|
Nov 10th, 2023, 08:22 | #4 |
Member
Last Online: Today 09:03
Join Date: Jul 2013
Location: Leics
|
A faulty fuel pressure regulator can give problems. Not 100% certain it is your problem but it is easy enough to check.
The regulator works by using vacuum or pressure from the inlet manifold to operate a diaphram. If the diaphram becomes ripped or torn it ceases to function properly. The vacuum gets to the regulator through a smallish bore pipe running from the manifold. The other thicker pipe on the regulator is a fuel pipe going to the fuel rail. To check if the regulator is ok carefully pull the small pipe off the regulator (there is no clip on it usually). If petrol comes out of the pipe or if it smells strongly of petrol then the diaphram is no good and another regulator is required. The regulator cannot be dismantled in a non destructive way. You can find the strength of the regulator stamped on it's body - usually 3 bar but some are 2.5 bar. These cars came with only one fuel filter. The early cars had it on the bulkhead, but later ones have it under the car. Tim |
Nov 10th, 2023, 09:51 | #5 |
Trader Volvo in my veins
Last Online: Yesterday 20:51
Join Date: Dec 2004
Location: Anglesey
|
It does sound like a lambda sensor issue. The ECU does not react to lambda signal until it has warmed a little and then it starts to adjust.
The FPR tends to leak fuel into the vacuum pipe connected to it as the typical mode of failure causing over rich idle |
Nov 10th, 2023, 13:24 | #6 |
Member
Last Online: Jun 18th, 2024 18:34
Join Date: Mar 2008
Location: sevenoaks
|
pressure fuel regulator
Hi Had a similar problem with my 240.Changed the fuel regulator no change.
Replaced the Coolant Temperature Sensor the one under number 3 cylinder under the manifold.Problem solved. |
Nov 10th, 2023, 15:47 | #7 |
New Member
Last Online: Feb 8th, 2024 14:01
Join Date: Dec 2009
Location: Market Drayton
|
230ina245, thanks, I pulled off the vacuum hose and all looked - and smelled - good. No petrol came out. I'll see what happens if I try with the engine running.
Classicswede, the catalytic converter has been "rodded through" and the sensor which plugs into the side has had all its wires cut. (All before I bought the car). So I don't know how the ECU ignores this, but the car has worked fine for my three years of ownership ... until a few weeks ago. Mrredwards, thank you for that suggestion. I'll try temporarily disconnecting the temperature sensor and see what happens. |
Nov 11th, 2023, 15:12 | #8 |
New Member
Last Online: Feb 8th, 2024 14:01
Join Date: Dec 2009
Location: Market Drayton
|
Hmm. I can't actually see the coolant temp sensor - it's all obscured by inlet manifold etc. Tell me I don't have to take that off!
|
Nov 12th, 2023, 17:16 | #9 |
Master Member
Last Online: Yesterday 22:52
Join Date: Nov 2012
Location: London and Cambridge
|
It’s a common misconception that you’ll need to remove the inlet manifold to get to the coolant sensor- you don’t. You’ll need a deep socket and only replace it with a Bosch one- the other sensors available seem to fairly quickly.
Cheers |
Nov 13th, 2023, 09:33 | #10 |
New Member
Last Online: Feb 8th, 2024 14:01
Join Date: Dec 2009
Location: Market Drayton
|
Bugjam, thanks for that. My problem is that I don't know exactly what I'm looking for or exactly where it is. There's a lot of manifold metalwork and hoses etc. in the way!
|
Tags |
fuel, fuel filter |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
|
|