fuel pump over | Posts 16+

Okay, the fuel lines are new, and the valve at the top of the filter is also new, but now it's not working at all. A relatively new, quite unhealthy noise coming from the back somewhere -> fuel pump. It sounds like a mini-mixer. If I put a jar in front, I think I could fill it in about a quarter of an hour. That's clearly not enough funding.

Wo kann ich sowas bekommen? Haben Sie einen guten Tipp? Oder muss ich wirklich mittags Feierabend machen und die Schrottplätze der Region abklappern, weil neu nicht in Frage kommt (ich habe Preise jenseits der 200 Euro-Grenze gesehen!!!)? Die Pumpe ist übrigens von Pierburg, die genaue Bezeichnung ist genau unter dem Anschluss. Ist das überhaupt wichtig? "Passen" ist ja fast relativ, sind ja nur 2 Schläuche und ein Stromanschluss dran. That's why I'm wondering if this little one might actually work: http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&rd=1&item=7916569841

Hello,

Now, let's take it slow, it can't be that difficult to just get a few rubber hoses and the return valve sealed?

Your engine does not have a fuel pump in the tank. Again: there's nothing!
Consequently, where there is nothing, no sounds can originate.

The fuel is sucked into the tank through a suction pipe in the "Schwipp-Schwapp" fuel bowl, the fuel line goes directly to the diesel filter and from there to the fuel pump. Within the fuel pump itself, there is a wing-type pump located on the drive shaft, which sucks fuel through the fuel filter and maintains internal pressure within the fuel pump.
This speed-dependent internal pressure is used by the ESP to adjust the start of the flow.

All diesel that remains in the fuel injectors and does not get injected and essentially escapes through the needle, flows through the leak oil lines and the fuel return of the ESP to the switching valve at the diesel filter. Is this valve warm? Does it go directly back to the tank, or does it go directly to the diesel filter?

Have you bled the air out of the line from the diesel filter to the fuel pump?

The 1.6 engine also starts without pre-heating under current temperatures after a few seconds of full throttle, as long as the ESP Diesel gets fuel.

Hello, Rainer

and there is also a pump

It's located right in front of the rear axle, underneath the fuel tank on the undercarriage. It's a Pierburg brand and is a typical silver-colored cylinder. Interestingly, just now two scrap metal dealers independently assured me that this pump is not usually there, and now you're also coming along.

But if I remember correctly , my grandfather, who previously owned the car, had similar starting problems (this was around 70-80,000 km, so about 5 years ago). During the repairs that were carried out at that time, he also mentioned an additional pump. It turned out that the problem was with the pre-heating system, which (as mentioned earlier) was solved by a temperature sensor -> infinite (disconnected). This could be the aforementioned pump under the car, which I don't believe was subsequently removed. If the rain with the thread-like raindrops (hopefully) stops, I'll just cross the old pump.

Another question: Could my fuel pump sustain permanent damage if I repeatedly have to completely bleed the entire fuel system?

The pump was clearly installed later. This is evident from the different types of fittings, the coiled additional hose, and the fact that the hose coming from the tank fits perfectly onto the pipe that goes directly to the filter. Now I've also put it back in, and lo and behold: the engine is running.

Air bubbles are still present in the transparent hose between the filter and the ESP, but it is possible that they will disappear after allowing the system to run for a while. I'll just get a clamp and then I'll go for a drive... I'll see if the ADAC has to tow me.

the issue was (.51.0):



Now, it doesn't start so well, and I always have to give it a bit of a "kick". Probably still slightly leaky. But I have some clamps left - I'll replace all the short hose connections in the engine compartment and see if the fuel filter (better: the connection to the flange) is sealed. And then, it must definitely have at least 300,000 km on the odometer

Hi

I don't get the feeling that your car is in a really bad state...

As I mentioned, if the fuel lines are sealed, the diesel filter + switching valve is okay, and the wing pump in the ESP is performing its function, then the additional pump is superfluous like an extra appendage.

Were there any experiments conducted using frying oil or similar? There are people who prefer to install a pump instead of thicker pipes.

Hello, Rainer

190 km/h in a flat area without headwind and without any jolting Turns smoothly to the maximum angle.

The funny pump has come loose, and the thermostatic valve (which the dealer sold without a seal without comment) now has a seal, and the bubbles in the line are gone. Starting is no longer a problem, and even after a night, the juice doesn't run back into the tank. Perfect. Next weekend, we have 2000 km to cover - now we can get started.

Thank you to everyone who contributed with their expertise!!!