Stupid question

[mikeufo]

This will most likely seem like a stupid question for those that know the answer. Today I removed the fuel pump and filter and I noticed that behind the filter is another black cylinder - what is this? Second stupid question - could someone explain the fuel circuit - lots of hoses that would appear to have little purpose!!

[mikeufo]

OK - does not seem like I'm going to get an easy straight forward answer - so here is another one - Now that I have the fuel pump out should I replace it? Are they prone to problems?

[mikeufo]

Your description is the reason that I'm asking the question - I do not appear to have a fuel return line from the engine bay. I suspect that the system is designed so that excess fuel is immediately returned to the tank after the "carbon canister. My main fuel line from the back of the car to the front comes off of the carbon canister and there is another line from the carbon canister back to the tank, however there are a couple of other spare lines - hence my confusion!!

[mikeufo]

Got it sorted I think, many thanks to those who responded. Quite correct - the fuel goes from tank to pump, through the metal filter then enters the hard pipe through the centre tunnel (this is the bit I was not getting) - somebody has conveniently marked the pipes as they come out from under the water header tank - see picture. The lines then return through the centre tunnel and emerge at the passengers side and return to the fuel tank. To be honest I'm very surprised that they got away with having a fuel line going through the centre tunnel carrying high pressure fuel (100 psi). Attaching photos so that it might help others that don't quite understand in the future