Why is there a return line for fuel?
It’s primary purpose is to return excess fuel from the carburetor to the fuel pump, however it serves other important functions as well. Aside from providing a path for excess fuel to return to the tank, the fuel return hose also prevents vapor lock and over pressurization from occurring within the carburetor.
How do you purge air from fuel lines?
To purge air from the low-pressure side of the fuel system, open fuel-line unions and bleed ports downstream of the pump, one at a time, beginning with those closest to the pump, and continue pumping until fuel, and not air, runs out. Air bubbles in a fuel line can lead to stalling, hiccuping or refusal to start.
Why does my VW T6 Transporter not start?
Key in, ignition on for couple of seconds, and it fires up, but runs really rough on 3 cylinders. Turn off, start again, and the same. Turn off, try to start and it’s just spins over. Try few mins later and it starts, but still a little rough on tick over, so leave running for a few mins untouched and eventually it seems to clear.
How to Prime the VW TDI engine fuel pump?
Run the fuel pumps to prime the fuel lines anytime the fuel system is opened. This is done during VW TDI and Audi TDI engine fuel filter replacement http://www.myturbodiesel.com/1000q/a5… on the 2009+ engines. Earlier engines run the fuel pumps whenever the key is turned to ON. Visit http://www.myturbodiesel.com for more VW TDI and Audi TDI FAQ..
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How does the fuel supply line work in a car?
This fuel mixes with the hot unused fuel that has been forced back into the supply line by the pump/injectors. This results in a uniform temperature of the fuel in the supply line running to all cylinders. All pump/injectors are supplied with the same fuel mass, and the engine runs smoothly.