I have had the low fuel pressure warning on a 66 plate Volvo for a while now. It comes on a couple of times a day. Also i lose power, mostly when pulling a load up hills, it won’t rev anymore until i let my foot off the gas and then press it down again, sometimes it loses power when cruising at 56 mph.
It’s been into Volvo overnight 3 times now and as far as i know, they have put new fuel filters in although they said they wasn’t sure this would fix it, also it’s not the fuel sender pipe, as we have had that out and it’s not blocked.
Anyone had similar problems or know what it could be?
Fuel pressure regulator, fuel pump or fuel pump power supply, ECU problem, wiring loom problem…take your pick. Unfortunately they can take time and money to diagnose and we could be talking £100s just to diagnose because often you can’t just get it to do it when the vehicle is sat in the workshop. I don’t know of any who have rolling roads where you can put a truck on and do a hard acceleration run which you’d need to do whilst doing live monitoring of sensors to see what’s going on. For cars I can name three within 30 miles of me but nothing that’ll take a truck.
Sometimes it’s not possible to find an intermittent fault until it properly breaks.
Conor:
Fuel pressure regulator, fuel pump or fuel pump power supply, ECU problem, wiring loom problem…take your pick. Unfortunately they can take time and money to diagnose and we could be talking £100s just to diagnose because often you can’t just get it to do it when the vehicle is sat in the workshop. I don’t know of any who have rolling roads where you can put a truck on and do a hard acceleration run which you’d need to do whilst doing live monitoring of sensors to see what’s going on. For cars I can name three within 30 miles of me but nothing that’ll take a truck.
Sometimes it’s not possible to find an intermittent fault until it properly breaks.
They changed a sensor last night and took it for a spin, unit only and assumed it was fixed. Only when i get a trailer on with some weight does it start with the problems.
The cost is in the thousands and still not fixed. It confuses me how you can pay for a job doing and it not been done,yet you are charged for it. It’s like a haulier taking a load from A to C when he should have gone from A to B and still charging the customer
Feel your pain. Sadly its something that customers have brought on ourselves as many don’t see why they should be paying for diagnosis and expect a garage to spend hours diagnosing a fault at their expense with no guarantee of getting the work. I’m not saying that’s you but especially when it comes to cars it is the majority of people who think that.
Modern technology is a complicated nightmare to maintain out of warranty.That’s why modern trucks and cars have the depreciation curve of a rock falling off a cliff.
I’d guess a good place to start would be to see if the ECU has lost or corrupted its load map.Access to that will inevitably be dealer only at dealer price.
If that’s ok there’s probably loads of inbuilt emmissions variables in the way between that and the injectors all modifying the fuel supply as they see fit.Which means looking for a needle in a haystack at ££££ per hour to look for it.
i am not a volvo tech .But you really need to get it in on the day shift ,Days generally have more experience and can spend more time on it …Nightshifts generally just service and do the odd fault
If like DAF which i will guess they are ,There will be a fault code This fault code with DAF again cant see why volvo would differ can be cross referenced ,and you get a list of possible causes and a fault tree …so for example ours says put the gauge on here and you should bet X bar you answer yes / no and it tells you to go to step 2 …There will be all sorts of tests that can be done …Nowdays injectors are prone to failure ,mainly due to the fuel .so if your are in the south west you are screwed…You probably have too much injector leak off …Filters and pressure switch are simple cheap items ,also they should be road testing it with a trailer and going up a hill as that is when the engine is requesting high pressure ,which your vehicle can’t maintain hence the light ,which then goes out when you remove your foot from the throttle.Fuel faults can be a pain ,though not always ,Following the manufacturers guidance ,though not infallable generally solves it …And they will have a help line that days can use
Remove the stack pipe from tank, clean filter on bottom, ensure no kinks in fuel lines under catwalk,
On FH12/13 not V4 there’s a couple of pipes Witch take exhaust gases oil fumes, to be burnt these carbon up, and reduce HP. Also check boost control sensor.
Old school I know, but has anyone checked that the strainer in the tank is clear. Used to get that problem quite often if you got the diesel bug in the tank. Lorry would run along fi e till you needed it to work hard, then it didn’t want to know.
Worth a look, although you would hope that someone already has.
Old John:
Old school I know, but has anyone checked that the strainer in the tank is clear. Used to get that problem quite often if you got the diesel bug in the tank. Lorry would run along fi e till you needed it to work hard, then it didn’t want to know.
Worth a look, although you would hope that someone already has.
If you mean the fuel sender pipe, then yes, already checked and all clear
Conor:
Feel your pain. Sadly its something that customers have brought on ourselves as many don’t see why they should be paying for diagnosis and expect a garage to spend hours diagnosing a fault at their expense with no guarantee of getting the work. I’m not saying that’s you but especially when it comes to cars it is the majority of people who think that.
The Volvo dealership have had it for a total of 36 hours now and it’s cost £3000 but the problem still exists. It’s back in tonight, 4th time lucky
norb:
i am not a volvo tech .But you really need to get it in on the day shift ,Days generally have more experience and can spend more time on it …Nightshifts generally just service and do the odd fault
If like DAF which i will guess they are ,There will be a fault code This fault code with DAF again cant see why volvo would differ can be cross referenced ,and you get a list of possible causes and a fault tree …so for example ours says put the gauge on here and you should bet X bar you answer yes / no and it tells you to go to step 2 …There will be all sorts of tests that can be done …Nowdays injectors are prone to failure ,mainly due to the fuel .so if your are in the south west you are screwed…You probably have too much injector leak off …Filters and pressure switch are simple cheap items ,also they should be road testing it with a trailer and going up a hill as that is when the engine is requesting high pressure ,which your vehicle can’t maintain hence the light ,which then goes out when you remove your foot from the throttle.Fuel faults can be a pain ,though not always ,Following the manufacturers guidance ,though not infallable generally solves it …And they will have a help line that days can use
Yeah i have thought the same about the night shift at Volvo dealerships over the years as i’ve dealt with them at various hauliers i’ve worked for. They appear to just be fitters and have limited knowledge on the workings of the unit.
I have wondered why they can’t cross reference the issue, surely this problem has happened before.
Anyway, they have prioritised it when it goes in tonight as they’ve been made aware that we’ve paid thousands for work that is basically not been completed
Carryfast:
Modern technology is a complicated nightmare to maintain out of warranty.That’s why modern trucks and cars have the depreciation curve of a rock falling off a cliff.
I’d guess a good place to start would be to see if the ECU has lost or corrupted its load map.Access to that will inevitably be dealer only at dealer price.
If that’s ok there’s probably loads of inbuilt emmissions variables in the way between that and the injectors all modifying the fuel supply as they see fit.Which means looking for a needle in a haystack at ££££ per hour to look for it.
It’s been in at main Volvo dealer 3 times, so it’s supposedly in the best hands possible. 4th time lucky tonight hopefully
I think I would escalate it, get Volvo involved, tell them you want another vehicle and not to contact you until yours was fixed, be that hours, days or weeks, it tends to focus the dealerships when they have to supply a vehicle or keep paying rental on one.
Wheel Nut:
I think I would escalate it, get Volvo involved, tell them you want another vehicle and not to contact you until yours was fixed, be that hours, days or weeks, it tends to focus the dealerships when they have to supply a vehicle or keep paying rental on one.
Could be a possibility, we only bought it from Volvo 6 months ago, warranty doesn’t include anything they’ve supposedly fixed so far
Wheel Nut:
I think I would escalate it, get Volvo involved, tell them you want another vehicle and not to contact you until yours was fixed, be that hours, days or weeks, it tends to focus the dealerships when they have to supply a vehicle or keep paying rental on one.
It’s out of warranty ? which means that everything is chargeable.They also have no obligation to even take on the job.
Conor:
Feel your pain. Sadly its something that customers have brought on ourselves as many don’t see why they should be paying for diagnosis and expect a garage to spend hours diagnosing a fault at their expense with no guarantee of getting the work. I’m not saying that’s you but especially when it comes to cars it is the majority of people who think that.
Agreed. This is an issue. Equally though there are outfits that charge good money for diagnosis, but don’t have the required skills to complete the task in a reasonable time. At that point costs are going to spiral quickly. With the increase in complexity and electronics, this problem isn’t going away any time soon.
ArcticMonkey:
we only bought it from Volvo 6 months ago, warranty doesn’t include anything they’ve supposedly fixed so far
Sounds like an approved used with their 12 month warranty ?.
So instead of looking for a problem caused by the components that are covered they’ve charged you for finding and fixing things that aren’t broke that aren’t covered.Seems like a plan.
As for their warranty the fair wear and tear or sudden failure get outs could be applied to virtually everything that’s supposedly covered.
