UrS Fuel System: From the Tank to Injectors and Back Again

[UrS4boy]

Our C4 UrS sedans and avants (and S2s and RS2s) have three fuel lines, as shown in the schematic below (note the hyperlinks to more info are underlined)

1. A high pressure feed line from the fuel tank and 091G pump to the fuel filter, fuel rail and injectors and fuel pressure regulator,
2. A low pressure returnline from the fuel pressure regulator back to the fuel tank and
3. A fuel vapour line to the fuel emissions canister.



Here is the C4 fuel tank and inlet parts, note Item 6 the retaining ring used to hold the top of the fuel sender plate tight to the fuel tank.



To ensure no fuel or vapour leaks, there is a large O-ring that sits between the top of the tank and the bottom of the C4 fuel lever sender plate (Item 4 here):



Here is an example C4 fuel sender coming out of the tank:



Here are the C4 fuel lines:



Here are the 3B and ABY fuel lines:



At this point in their lives, you might want to check your fuel lines and, as need be, use : Fred Munro's Fuel Line Maintenance DIY pdf

Better safe than sorry.

[macspring]

Thanks Dave, might be just me, but the Fred link doesn't work ?

[audinut]

didnt work for me either

[UrS4boy]

Thanks Dave, might be just me, but the Fred link doesn't work ?

It was a double quotation mark issue resulting from processing the original Kawf html document through WORD for vBulletin. Should all be fixed now.