Fuel tank "ticking" sound

[Potluckslammy]

A3, "ticking" sound coming from tank when running. Don't think my other one makes the same noise. Would say it's the fuel pump, but I don't yet understand how the fuel system works. I know the injectors are mechanical...so the in-tank pump and aux lift pump arrangement I'm familiar with don't seem to be necessary. If there is an in-tank pump, it doesn't run by powering the electrical system...so is there a cut-out that only lets it run when the engine is running? Apologies...I can come to an understanding of the fuel system with further reading...and, I know, the TM's! But I would, please, like some advice as to what/why it's making this noise. It's concerning!

 

[Floridianson]

No in tank fuel pump on A3's. The noise comes from check valve on the tank feed line.

 

[Potluckslammy]

No in tank fuel pump on A3's. The noise comes from check valve on the tank feed line.

Thank you so much for the reply! I recall reading the check valve being a source of headaches. Considering all the trash that came out during the fuel filter change yesterday, I believe checking it out should be tops in the list! Thanks again!

 

[Floridianson]

No worries and you got a Timex takes a licking and keeps on ticking.

 

[dmetalmiki]

Open the filler cap...fumble around inside.....Remove..the..'Time Bomb' thingy!...
juss' kidding..Check the Valve as mentioned previous.

 

[Floridianson]

My A3 ran fine and always started but the check valve also ticked. Believe the fuel pump pulses and that causes the check valve to tick so we called it the truck Timex.