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ourkid · Posted: Tue Sep 16, 2008 9:41 pm Post subject: Yet another fuel pump question!

I know these pumps are known to make a racket but mine is starting to bug me and the wife hates being in the car because of it,especially in slow traffic i have to crank the stereo up.It doesn't sound laboured or starved of fuel,just a loud constant buzz

I've seen pedestrians turn and look to see what the noise is.The car runs fine and it's been like this since i got it about 2 months ago.The guy i bought it from said it was normal.

I have the option of changing it for a Sytec - is this a worthwhile swap (as regards noise reduction and reliability),or can i sleeve my pump in foam?

cheers,
Ade.
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1983 924 N/A

Chrenan · Joined: 15 Jan 2003 Posts: 3903 Location: Canada

Your pump is is trying to be nice to you, it is warning you that it is about to die an leave you stranded. Replace it with a new one, both Bosch and Pierburg make a CIS pump for our systems. A regular EFI or carb pump won't push nearly the pressure you need. The pumps are always a bit loud and buzzy, but certainly not something pedestrians should notice.
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1987 951 - M193 Version for Japan

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Where to buy:
http://www.shokan.com/catalog/product_info.php?products_id=451
http://www.allzim.com/acatalog/Pierburg_Fuel_Pump__911_77_80.html
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erstwhile owner of just about every 924 variant ever made

Rich H · Posted: Wed Sep 17, 2008 12:31 am Post subject:

Even better: http://gsfcarparts.com/
part number 18369 for half the price with free shipping...

I need one too I suppose...

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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

ourkid · Posted: Wed Sep 17, 2008 3:09 am Post subject:

Thanks for that....

The reason i say Sytec is that i've been told by fuel systems supplier Glencoe that the Sytec FP604 is a replacement for the original and i may have one to hand,
but,i may have imagined it but did someone on here say to avoid Sytec for some reason?

Also,if my in-tank pump stopped working would that make the external pump noisy?(or would the car have stopped running by now anyway?)

I'm getting a 12v feed to the in-tank pump - should i be able to feel/hear it running?

Thanks.
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1983 924 N/A

Chrenan · Joined: 15 Jan 2003 Posts: 3903 Location: Canada

Yes, if your in tank pump dies your external pump will be working harder and may be noisier. If you replace one, you might as well replace both, the in-tank is the cheaper of the two.
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1987 951 - M193 Version for Japan

2Fast · Joined: 09 Dec 2007 Posts: 459 Location: Klamath Falls, OR

Is it possible you are missing the fuel pump silencer? It runs between the hose from the tank, and the external fuel pump. I think it is a little black thing that forms a 90 degree angle. I did some research on it because my pump wasn't working at all. I want to say the silencer is somewheres around $38...hope it helps

Edit-I did a quick search...heres a topic I made some time ago about the silencer...http://www.924board.org/viewtopic.php?t=26508&highlight=
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=====>Alex<=====
1979 Porsche 924 NA 5spd
1979 Parts Porshce 924 NA 5spd