oaros

Variation on a theme. One little part of the hose about ready to come off and get stuck in the hose/main pump.

dr bob

The RVP number that Jim relates is great. But let's throw something more into the mix-- Higher altitudes get a fuel blend tailored for the altitude, with both a lower octane and a higher boiling point. Why lower octane? Lower atmospheric pressure at higher altitudes means the cylinder pressures will be lower. A faster burn actually helps in some cases, especially starting in the winter.

AO

Thanks guys, it's clearer now.

MrLexse

When the in-tank pump rubber fails, the pieces often end up landing in the external pump, causing it's failure. Ask me how I know. When I had to replace both pumps, I tested the in tank pump and found nothing wrong with it other than the rubber hose breaking apart. I picked up some braided stainless steel fuel line from the local speed shop ($4.00 for a foot, IIRC) and replaced the failed rubber with it. I bucket tested the original pump and it worked perfectly, so I kept it as a spare and repeated the modification on the new pump as well. The whole process took a half hour and although I had to repair the wires I cut on the original pump, the new pump needed nothing but the hose replacement. It's been working fine since then. Pics are of the reserve pump.

AO

We measured it at Murph's, but of course I didn't write it down. I want to say the stock Porsche strainer is a hair less than 10mm. The new piece we had made is 12mm. The in-tank pump is around 7mm.*








Copious amounts of alcohol were used in the measurement of these items and are subject to sober evaluation.

FUSE69

I've got a new part in front of me... that I was ready to install with an '044'

ID is 10mm (I haven't had a drink yet...)

So when will this kit be available for purchase??

FUSE69

Bump...

Any outlook on this kit coming to market??

928 at last

They may be available now.

928mac

I am also interested in this fix.
Mine leaked all last year and I had to keep a tray under it at home.
The treads in the tank did not look like the problem to me but after pulling it twice I'm ready to try something different.

Brad

Spun

Me2... I'm in. Where can or who can I get a kit from.

I am a bit concerned about the heat/vapor pressure due to nice warm summers here in Tucson, but I will risk it based on the "Texas" test. Not too much difference between Tucson and most of TX. Little warmer in Phoenix and Lake Havasu is over the top hot.

I have a 89 S4 - no SC yet.

And just to make sure, it is the Bosch 0 580 254 044 Inline Fuel Pump correct?

And and installation instructions would be a nice bonus as well just to ensure against defective user

Z

Yes, that should be the correct part number for the "044" pump. I'm pretty sure that it can be obtained from whoever your favorite usual 928 parts supplier is.

The new type of strainer to replace the in tank pump that's talked about in that thread, is available from:

www.Murf928.com

It's not on the web site there, but you can get in contact with Tim through the e-mail address shown on the "Contact" page there.

Spun

Again, thank you

ROG100

I have stock of the 044 pumps for $256.

Spun

anyone know why the fuel pump would whine some times? High pitch wine. Car runs just fine, just sometimes the pump wines.

Rob Edwards

'Cause it's working hard against resistance somewhere in the fuel circuit (in-tank pump failure or blockage by split hose, partially plugged fuel filter, kinked fuel system vent hose, failed charcoal tank solenoid valve, or other failure I'm not thinking of right now....) ?

Is the whine only at high engine load? When the tank is super low on fuel? hot temps, cold temps, is one of the hoses touching/rubbing on the tank cradle or fuel filter cover and transmitting noise? Is the tank tight up against the cradle straps or is it collapsing a bit (suggesting a vacuum being pulled in the tank)?

Several possibilities.