Replace Solenoid Valve: DIY Guide & Tips

Hello,

'My Volvo V70 TDI usually starts immediately. However, lately, it's been happening more and more often that it doesn't want to start. Even if I hold the starter for a long time, it usually takes 2-3 attempts, and then I have to wait for about 20 seconds before it starts. This happens about every 1-2 weeks now. I don't think it's a problem with the fuel pump, and I don't believe air is getting into the fuel lines. I'm a bit worried that it might eventually not start at all. This kind of thing always happens when it's the least convenient.'

In my opinion, the problem is likely due to the shut-off valve. However, it probably won't be easy to replace, as it seems to be integrated into the fuel injection pump.
The engine is a 5-cylinder, 2.5-liter TDI with 103 kW. It's essentially a VW/Audi engine and very similar to the AEL engine found in the first generation A6.

Does anyone have any experience with replacing the fuel shut-off valve yourself, or should I just let the Bosch service do it?

Bye.
Michi.

Have you ever had the error codes read by Volvo, or what makes you so sure...? There could be several reasons for this. For example, why can you rule out a problem with the immobilizer?

I'll have the error memory checked next week. However, it only showed an error once, after it wouldn't start. But then the light went off again after a few kilometers.

I ruled out the immobilizer because the LED on the alarm system blinks red when the key is not recognized. I even checked this by wrapping the plastic part of the key in aluminum foil. If the immobilizer were defective, it should recognize the key correctly but still not release the shut-off valve. I think that would be quite unusual, wouldn't it?

If the problem is due to air in the fuel lines, it should happen more frequently and likely after longer periods of inactivity, rather than every two weeks.

Otherwise, I'm not completely sure that the problem lies with the shut-off valve, but if someone here has said that it's not a problem to replace that part, I could rule out another potential source of the issue. I'm also open to other ideas or suggestions.

Okay, I'll check the error codes first.