Hi I have a fuel problem with my audi it won't start just cranks over, it runs when towed but as soon as we stop, it cuts out I can't suck fuel up from the tank using the pipe before it goes into the filter so does that mean I have a hole somewhere letting air in? Many thanks.

 

I had a similar problem but with a very very hard start that ran rich until the engine warmed up. As my fuel pump was replaced in the previous year it seemed unlikely to be the problem (at that time the car was completely unable to start/run and no startup priming sounds from the fuel pump when switching the ignition from off to on)

It turned out to be the fuel pressure regulator (adjusts based on engine vacuum pressure - so also check for vacuum leaks).. might be something for you to look in to.

It is fairly easy to replace on the v6 as on the top of the engine on the fuel rail and just held in with a retaining clip - not sure which engine you have?

Be very careful when dealing with the fuel line.. do the job outside away from anything combustible and remove the fuel pump fuse first and crank the engine a few times to reduce any possible pressure in the fuel line before removing the regulator so it doesn't spray fuel everywhere when you pull it out.

For extra safety disconnect the battery to avoid any potential sparks.. but make sure you know the radio security code before you do so otherwise you won't have a functioning radio when you hook up the battery again as it will be locked until you enter the code. Also make sure the buttons all work on the radio as you need to enter the code with the buttons and if one isn't working you can't enter the code properly.

 

Thanks going to have another look at the weekend, I have the b5, the in tank pump doesn't bring fuel up only pumps it around in my tank and I can hear it working.

 

Do you have fuel pressure at the rail? You can check by disconnecting the line at the fuel rail into a pop bottle and turn the car to the on position. If you don’t have fuel then the pump may be done. If you hear the pump then something may be plugging the line or like you said, leaking back into the tank. Only one way to see if the pump is actually functioning is to take it out and bench test it and/or look for a line that is leaking.

 

Hi so my car is giving a code

This is the code y car is giving me which it wont clear.

 

I have got the sensor from the tank is there any way to test it as I can't seem to find a replacement anywhere?