AFN Springt nicht an | Posts 32+

The workshop claims that the debris and everything else came from my old tank, and that they didn't replace it. *shrug*
The workshop is really bad... they probably messed up my part or something.
Is there a way to avoid having to buy a new one?
They also cost another 130 euros.
Perhaps if I put the hose directly into the tank and bypass the VFP...

Do you think that could work?

It seems to be a nice...store .

Hmmmmmm..... The best option is really the original part. That will restore your system to 100% functionality. If the original new part is 'too expensive,' then check with a salvage yard (e.g., r-a-r). You might find something there. I would avoid modifying the hose. If I remember correctly, there's a coarse pre-filter on the intake basket. Furthermore, with a hose-based solution, you also have the problem of hose length and intake pulsation dampening, etc.

Before you start working on anything, please first check for a check valve in the diesel fuel supply line, or make sure that the supply and return lines haven't been accidentally reversed. You know, specialists always do something special...

*LOL*

How can I test this? Which hose goes where?

Take off your shoes and try to leave them?

There's a thicker and a thinner hose. The thicker one runs from the tank, through the fuel filter (DiFi), to the injection pump. The thinner one runs from the leak-off connection of the injection pump, presumably through the fuel filter to the tank. You can identify a check valve by an additional component that's about the thickness of your thumb, installed in the hose. I strongly suspect either a check valve or a confusion between the supply and return lines. Your VFP essentially fills the diesel tank from the back, through the cold kitchen area.

Hello.


The diameter of both pipes is unfortunately the same:(.


Unfortunately, I can't find the vent anywhere in the entire car.
Not in the engine compartment, not behind the air filter, not on the floor, and not on the fuel tank.

I can't believe that. If the car isn't modified, you typically have an 8mm positive camber and a 6mm negative camber. I know enough vehicles where a non-return valve is standardly installed in the return line after the diesel filter.

You will usually find arrows marked near the fuel filler neck indicating the direction of fuel flow.

I can't believe that. If the car isn't modified, you usually have an 8mm lead and a 6mm lag. I know enough vehicles where a check valve is standardly installed in the return line after the diesel filter...

Hello,
What is that supposed to achieve?
Best regards,
Günther.

I'm sorry, but that's unfortunately a fact... I measured it with a ruler.
I'm afraid that, again, the workshop messed something up...

Damn it, this is a pain.

I'm now blowing into the return line of the diesel filter and observing which line the diesel is leaking from. I've located the markings on the tank.

Hello,
What is that supposed to achieve?
Best regards,
Günther

What do you think?

Hello,
What is that supposed to achieve?
Best regards,
Günther

What do you think?

Hello,
A check valve in the return flow? Unnecessary! Perfectly understandable in the initial stages!
If you then swap the two lines, the pre-pump shouldn't make any difference, right?
Best regards,
Günther.

What do you think about the option of preventing the complete shutdown of the diesel line?
The return line essentially ends in the air within the tank. What happens when you turn off the engine and the end of the return line is suspended in the air, and logically, your fuel line leading to the tank will drain? Correct: it will run dry. However, the check valve prevents the fuel from flowing back. It opens when the injection pump pumps and introduces a certain pressure into the return line via the leak oil line.

What do you think about the option of preventing the complete shutdown of the diesel line?
The return line essentially ends in the air within the tank. What happens when you turn off the engine and the end of the return line is suspended in the air, and logically, your fuel line leading to the tank will drain? Correct: it will run dry. However, the check valve prevents the fuel from flowing back. It opens when the injection pump pumps and introduces a certain pressure into the return line via the leak oil line.

Hello,
Returning the liquid below the fuel level achieves the same result and costs less!
Why complicate things when there's a simpler way? Otherwise, a check valve in the suction line makes logical sense.
Best regards,
Günther.

'Since when have the distributor and fuel injection pump been located below the fuel level?' I think in this case, it's easier to install a check valve for a few cents than to relocate the distributor and fuel injection pump, also for maintenance reasons, to a position below the fuel level. Or am I missing something?

Since when have the distributor and fuel injection pump been located below the fuel level? I think in this case, it's easier to install a check valve for a few cents than to move the distributor and fuel injection pump, also for maintenance reasons, below the fuel level. Or am I seeing something wrong?

Hello,
If the 'return outlet' were to open at the bottom of the tank, the system would not be able to drain completely.
Best regards,
Günther.

PS: For me, this discussion is over!

But she doesn't!

Why end the discussion? Can something not be what it cannot be?

But they don't!

Malformed! As often happens!