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S2 Fuel System Advice

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chrisjcoe

New member
Hi guys

It's only a matter of weeks away before I can start to tackle the fuel pump issues on my S2. I have a very loud fuel pump which needs changing, an intermittantly failing fuel sender, and a corroded fuel line. There is some good info on the clarks garage website, and I hope this, combined with a 944 Haynes manual, will help with my first effort at back garden mechanics (that's not intended as a smutty euphamism!).

Clarks says "A clogged fuel filter can cause failure of the fuel pump. A failing fuel pressure regulator can also result in pump failure. It's a good idea when installing a new pump to perform a fuel pressure check and pump delivery rate check". is this an easy job? Can I achieve it with something as simple and cheap as this? Is there any advice you can give around this area?
 
Morning !

Yes, a failing fuel pump will cause these issues and when they become noisy thats a good bet that its failing. You can check flow rate by measuring the amount of fuel pumped over 1min, 30 secs etc.

TBH, I wouldn't bother and I'd just replace the fuel pump as an investment. The fuel pump sits right at the bottom of the fuel tank in a plastic bulge or shroud. My advice having done this job myself - drain the tank completely before attempting this job.

This way, you won't get covered in petrol and in addition to changing the pump without having to worry about fuel you can also remove and clean the large conical internal tank filter or purolator that sits in the neck of the tank to feed the pump.

The bulge that covers the pump is held in place by a large metal strap on the drivers side of the fuel tank.

If you go ahead and change the filter, beware of two things:

1. the small rubber cotton reel dollies that hold the fitments for the filter will almost certainly snap and you'll need two more.

2. The fitments to and from the filter could well be corroded and difficult to remove - if you have the time you could always remove all the pipework to/ from the filter and have the pipes and fitting replaced/ refurbished - I did this with mine and had the short rubber hoses converted to stainless steel and the fittments recoated.


Most of this is covered in clarks garage ISTR and the filter/pump set up is the same on an S2 as a Turbo.

Yours

Chris
 
Thanks Chris

So if you were going to measure it you recommend flow rate over the fuel pressure gauge? It needs replacing anyway, so perhaps I'll not bother checking the rate/pressure then. The fuel regulator isn't cheap, so it's not something I can just replace as a precautionary measure unfortunately.

The fitments to and from the filter could well be corroded and difficult to remove - if you have the time you could always remove all the pipework to/ from the filter and have the pipes and fitting replaced/ refurbished - I did this with mine and had the short rubber hoses converted to stainless steel and the fittments recoated.
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I presume you had this done professionally, how much did this cost you? How long did it take? Is this a job for a specialist?
 
hi chris have u got a fuel pump as i hav one for mine when i got my car old owner had got it think the pump was at fault but was the fpr so i dont need it any good to u iam from ipswich
 

ORIGINAL: jay944

hi chris have u got a fuel pump as i hav one for mine when i got my car old owner had got it think the pump was at fault but was the fpr so i dont need it any good to u iam from ipswich
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I'm in Ipswich now, working! If you a pump that needs a good home, I promise I'll feed and water it regularly! How much would you like for it? I am so tempted to change the FPR too, perhaps after I do the pump, sender and line, I'll have it tested for pressure.
 
hi chris if u give me a ring on 07951644730 my name is jamie we could meet up this evening if u are able to thanks jamie
 
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