On Fri, 23 Jun 2006 23:53:50 GMT, Mike Spera
wrote:

I have finally had enough of the bad sending unit on the right tank.
Since I want the beast in and out quickly, I figured I would get an
exchange unit from Airparts of Lock Haven. $500 core charge? Yikes! I
guess they REALLY want that core back!!! I believe the "stock" sending
units/gauges on a 74 Cherokee were Stewart Warner. I believe they made a
replacement Rochester combo and they are not interchangeable. Is this
correct?

Pretty much so. In the past it was always a lot easier to get any
Piper sending unit from Airparts.

As you mentioned, a lot of the old/new units were not interchangeable,
without changing out the gage also. However, Airparts has been
matching OEM Piper gages to the various replacements senders for a
looong time.

We typically sent all our engine indicating gages to Airparts at
overhaul so they could match them up to whatever replacement senders
were available at the time and send them back calibrated and
ready-to-install.

I have had these pups (fuel tanks) out in 1999 to change the sending
unit gaskets, replace the main fuel lines, and replace the overflow
hoses. I replaced the tank screws with the proper structural stainless
screws. Can I reuse them? I do not recall anything saying they were
"one-time".

If you don't screw them up taking them out (no pun intended), put them
right back in again. Be a good idea to have some spares though, just
in case...

TC