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Can anyone help me here

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Old Jan 14th, 2021, 13:37   #1
canis
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Default Can anyone help me here

Our diesel V40 is reporting low fuel pressure. I telephoned Volvo about it, who told me there are two fuel pumps, one in the tank and one in the engine bay. They quoted me £600 for the main pump. Well, I looked in the tank and there definately isn't. Not only is there no pump, there are no wires for a pump. The multiplug on the tank has only two wires, and they are for the fuel guage, the other terminals are just empty.

Volvo quoted me £600 for the main pump, and couldn't supply the other one. They refused to give me a part number. So I got in touch with a used parts supplier, and they had two types of pump but didn't know which would be the right one.

Can anyone look this up on VIDA or DICE or something? I've never used either of those tools so I don't know if it's possible.

I'd really appreciate some help on this issue. It would be nice to keep this high miler on the road, 320,000 miles or thereabouts, when I last looked. It's got service history about a mile long. I'd like to fix it as no matter what the cost it's still certainly a better car than we could buy for the same money.
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Old Jan 14th, 2021, 15:09   #2
Laird Scooby
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Originally Posted by canis View Post
Our diesel V40 is reporting low fuel pressure. I telephoned Volvo about it, who told me there are two fuel pumps, one in the tank and one in the engine bay. They quoted me £600 for the main pump. Well, I looked in the tank and there definately isn't. Not only is there no pump, there are no wires for a pump. The multiplug on the tank has only two wires, and they are for the fuel guage, the other terminals are just empty.

Volvo quoted me £600 for the main pump, and couldn't supply the other one. They refused to give me a part number. So I got in touch with a used parts supplier, and they had two types of pump but didn't know which would be the right one.

Can anyone look this up on VIDA or DICE or something? I've never used either of those tools so I don't know if it's possible.

I'd really appreciate some help on this issue. It would be nice to keep this high miler on the road, 320,000 miles or thereabouts, when I last looked. It's got service history about a mile long. I'd like to fix it as no matter what the cost it's still certainly a better car than we could buy for the same money.
Knowing what year etc your car is would be helpful. However, if you only have one pump that will be the injection pump and will be expensive. It's possible it's also coded to your car so will need to be recoded on the computer (VIDA?) to work properly.

You could try a heavy duty dose of fuel system/injector cleaner through the tank. When i say heavy duty, add the whole bottle to half a tank then repeat a week or two later :

https://www.halfords.com/motoring/en...te-247878.html

It worked for someone else on here with a misfire/starting problem and low pressure on two injectors so it's worth a go. Once it's been in there a couple of days, give the car an Italian decoke, selecting a lower gear to keep the revs up at the speed limit on the motorway or of there are no cameras, give it some welly to blow the cobwebs out!
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Old Jan 14th, 2021, 17:17   #3
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Hi Canis. Our base 2 1.9D definitely do not have a fuel pump in the fuel tank. End off. Not sure where they even got that idea. Quick question, ha e you read the codes with VIDA DiCE? Could the problem be the actual fuel pressure sensor or even the FPR?
It's more common for either the FPR or the fuel pressure sensor to fail, rather than the high pressure fuel pump

Ps. Even if it is the high pressure fuel pump, then it is definitely not coded to the ECU and it is as simple as plug and play for a new one
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Old Jan 16th, 2021, 19:12   #4
canis
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Quick question, ha e you read the codes with VIDA DiCE? Could the problem be the actual fuel pressure sensor or even the FPR?
It's more common for either the FPR or the fuel pressure sensor to fail, rather than the high pressure fuel pump
The codes were read by a garage mechanic, who was diagnosing another problem at the time (air-flow sensor, replaced that, all fixed), so it was only really mentioned in passing. The car is on a 53 plate, so i'm guessing a very late model.

I suppose it could be the sensor itself. I'm gonna try Scoob's suggestion and run some cleaner through it see if that makes a difference.
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Old Jun 23rd, 2021, 17:56   #5
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Default Air Flow Sensor

I removed my Air Flow Sensor and used special spray I got off Ebay. Vehicle running much better
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Old Jul 24th, 2021, 13:51   #6
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It's been over 2years since getting shut of my V40 1.9D and even longer since looking at something to do with fuel, poss pump in the tank.
This was accessed from in the car in the back seat area.
Seats removed for easier access, carpet lifted up beneath seats to access this.
I've done the same on petrol but feel sure there is something in same place on diesel models.
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Old Jul 24th, 2021, 14:15   #7
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Originally Posted by V40DSchariot View Post
It's been over 2years since getting shut of my V40 1.9D and even longer since looking at something to do with fuel, poss pump in the tank.
This was accessed from in the car in the back seat area.
Seats removed for easier access, carpet lifted up beneath seats to access this.
I've done the same on petrol but feel sure there is something in same place on diesel models.
There is definitely no fuel pump inside the fuel tank. If you check the connector going to the fuel sender unit, there are only two thin black wires, that are for the fuel gauge. The petrol models all have a fuel pump inside the tank and the connector has four wires
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