993turbo

Are the fuel tank level sensors repairable? Or do I have to bite the bullet and buy new ones?

davek9

Hi, it all depends on how bad they are corroded, some can be, a simple resister wire and float, I've been using the 944 sender, direct fit,, they just have an extra vent at the top that requires plugging, all hidden under the access cover.

Dave K

kawi825

I haven't dove into this yet but I will be this spring sometime. I bought one from roger and see that it has an extra outlet in it. So I'm assuming this is the vent you mention?

For the OP, look up roger, price wasn't too bad (was on sale), the old ones corrode and are super frail to begin with.

993turbo

Hmmm, ok... so the 944 unit fits? How much is the 944 unit?

993turbo

Any write-ups on this?

kawi825

Here's Dwayne's from an 88:
https://rennlist.com/forums/928-foru...nt-w-pics.html

993turbo

Cheers.

993turbo

This write-up simply details the removal, testing and refitting. This is very straight forward.

Any write-ups on the repair of the sensors?

kawi825

I may be wrong but there isn't much you can do aside from cleaning the TINY wire guides and float assembly which will be obvious once it's removed. You can test continuity as well when the float is up/down.

Shark2626

There are several YouTube videos. Click on the one with the silver 928S.

993turbo

Found it. Excellent. Cheers.

Rob Edwards

The fuel level senders are strung with 0.09 mm Nichrome wire, which has a resistance of about 50 ohms per foot. The level sender float varies the length of wire the gauge 'sees', so with an empty tank the gauge sees about 80 ohms, a full tank registers 5 to 8 ohms. For '78-88 the sender is rebuildable as long as it's not so badly corroded that the ground wire can no longer be attached to the center post. No such ground connector on the '89-95 senders, they're almost always rebuildable. Almost.

Here is the guts of an '89+ sender, to illustrate.

993turbo

Excellent info Rob.

993turbo

Already ordered some 0.09mm Nichrome. 60meters. Should last this lifetime. And the next. Perhaps even Covid-19.