UPDATE3: fuel starvation/loud pump on 83 urq

[ben swann]

Brady,

Drain the gas and put a couple gallons in and slosh around and drain
again.  Do repetitively if necessary.  Get all the crap out of the tank.

Install new pre-filter.  Re-Install the pump.

Fill with some clean gas and injector cleaner, but perhaps only a few
gallons at first to make sure that you don't have to drain the tank
again.

Once new pump is installed, verify fuel return line is not blocked.

I did this by disconnecting at line to CIS metering head and using
compressed air to blow back to the tank - be careful and make sure the
gas cap is off so you don't blow your tank!

BE CAREFUL! Working with gas.

It is interesting, you are having similar problems as I did when I got
the '83 I just got started after sitting since '96.  The pump was
locked up.  Installed relay above battery.

Flushed tank as above and checked lines were clear - return line a
little blocked.  Got better after running some clean gas through with
injector cleaner.

Installed new pump that was locked up the second I put power to it -
not because of the car or bad gas, it just came that way - defective.

Installed old leaky pump off a 4kq - ran but made crackly poppy noises
as if stressed, but started engine.  Engine did not run great under
load.  I think some of this was the pump, and some of it was the system
letting loose of all the varnish that had accumulated over the years.

Installed second new pump - now engine runs great!  Four fuel pumps
later.

Ben
[Hi All,

I changed the fuel pump today. Brand spanking new Bosch (no Pierberg
around in stock anywhere). Wow, it's nice working on non-winter-driven
cars. No broken bolts, no rust eye baths, much less swearing. Well, at
least until I went for a test drive.

The really loud old pump that crackled and changed pitch has been
replaced by a new one that does exactly the same thing. That means no
power and stumbling like before.

I'm still pretty sure it's a fuel problem since the O2 voltage drops to
0 when the car stumbles. My worries about the hot coil were unfounded.
The strut bar right next to it is just as hot.

What next? I have a plunger kit on order from the dealer. If it was
sticking, could it reduce pressure enough to close the injectors?

Is there anything else?

Help!

Cheers,
Brady Moffatt]