The problem of older cars is mainly due to the aging of the fuel system, the leakage of the younger cars, or the porosity due to material defects or careless negligence. The fuel system also has a good pair of plastic parts, metal and rubber pipes, all of which can be damaged or aged.
There are also characteristic, type-specific defects, the protagonist of which is a Volkswagen Passat with a 1.8T petrol turbo engine. The type (and its siblings based on the same foundation, such as the Audi A4 and A6) is fueled by a plastic tank mounted under the rear seat, from where the supply line starts and the return line returns. The two pairs run longitudinally with plastic-coated aluminum tubes. They get into the engine compartment next to the right front tower, run through the firewall, and are connected to them by the flexible rubber tubes of the gasoline branch and the return branch. A typical type of disease is the rupture of these aluminum tubes in the engine compartment. They break at the firewall attachment point, mainly due to material fatigue, since in vain the rubber tube passes all the vibrations to the metal tube, which is fixed. In addition to the material fatigue, they are also broken due to a mechanic’s fault, they are accidentally hit with a wrench, but we also saw someone whose hand tool got caught between the pipes and pulled it out. onto a pipe end with a threaded nut.
In our case, the firewall section at the supply pipe was repaired at the time of purchase and leaked at the gasoline bridge. For this reason, in May, the current professional dismantled the factory rubber tube and then replaced it with an 8mm aftermarket tube, which was secured with clamps on both sides. It is a beauty flaw that the aluminum tube has been broken so much that it cannot be fixed to the firewall at the factory. Theoretically, these gasoline pipes should also be able to withstand the heat load, as they are typically located close to the engine. For some reason, they can’t stand these cars. This is not the first experience that they will fly out very soon: in our case, 4 months and approx. It took 8000 km. The pipe runs at the height of the valve cover, a worrying condition appeared under the engine cover when the transformer was replaced. I decided not to replace it with the usual “ready-made” gasoline pipe (I’ve tried several brands before, all with cracked cloaks). For example, I called a VW dealer to see if a factory part was available. They helpfully searched for the item number and then said that the entire tube could only be ordered from the tank, in pairs, so the back and forth branch in one package, but it was no longer manufactured. The last known price in 2012 was at an altitude of 110,000 HUF: I don’t think many people bought it because I saw almost every B5 Passaton and contemporary Audi that runs an 1.8T engine with only the mask tube extensions. On my previous car like this, I had to replace a 12cm tube section, it was always cracked, so I replaced it every 2 months until I was bored and cut the picked-up piece lengthwise to see the condition of the outside scary tube inside. Well, it was good inside, so I didn’t trade from then on.
I could have assumed that the current tube wasn’t wrong inside either, however, it’s a 60cm section running above the engine. So I started researching the solutions, that’s why I went to Dunakeszi, where I have a “pipe specialist”, they already made automatic transmission oil cooling pipes for my BMW E30. I shared the problem and finally decided to buy a reinforced hydraulic hose. It most closely resembles the factory-designed pipe in its material characteristics, so I installed it in its assembled location. Now it’s in trial operation, and if the solution that has a good chance proves successful, you’ve made one from the same pipe with a fitting end, because presumably the factory didn’t accidentally use a threaded joint on the gas bridge side. Anyway, I cut a piece of the dismantled pipe cracked on the outside, but inside it was also intact.
Source: Autó-Motor by www.automotor.hu.
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