It is possible that the noise has always been there but I cant say Ive noticed it before. If anyone else has noticed a sudden increase in noise from the fuel pump which has eventually resulted in any issues with the fuel system such as hesitation, poor starting or running, etc, I'd be interested to hear about it.

Thanks.

Over five years late, but thanks for your answer.

I've become used to the noise of the fuel pump priming, but just lately I've noticed under the car, whilst the engine is running and after longer journeys, what I can only describe as a "rushing" sound.

The noise is similar to that made by the initial surge of fuel that forms part of the priming process, but has now become constant, although its not there after shorter, local journeys.

There's no noticeable effect on the car's performance and neither is there any smell of fuel, so I'm tempted to ignore it. However, I'm also aware that the advent of a new sound is often a precursor to problems.

Should I be concerned?

Edited by argybargy on 02/10/2016 at 16:24

No, I haven't. Is it fairly easy?

Thank you.

I did have a look on Youtube and found a US video which showed it in front of the offside (their nearside) rear wheel, but when I checked last night I couldn't find it; though I didn't look on the other side, come to think of it. Would the position vary according to the variant of Focus?

Haynes doesn't even mention it, which is odd, but only talks about the fuel pump.

Right, well that explains the omission of any mention of a fuel filter by Haynes.

So the fuel filter would be changed at the same time as the fuel pump, which means removing the tank.

Thanks again.

Cheers for that. I only notice the abovementioned noise after a longish trip, and driving around town there's no obviously unusual sound from the fuel system at all.

But I'll take your tip and keep a spare fuse on board.