On 10 Aug 2004 11:10:49 -0700, klijam64@email.pct.edu (Slipnfall)
wrote:

>Hi folks,
> I'v read almost all the posts here regarding the code 43(engine
>fuel supply) for my 1990 Accord(EX). About ~3000 miles ago, I
>physcially removed my EGR, completely cleaned it, installed a new fuel
>filter, and replaced my O2 sensor with a bosch replacement. When I
>installed the last o2 sensor, there was oil surrounding(but not
>penetrating) the plug. I cleaned it well with contact cleaner.
>
>The code 43 went away until yesterday, when I was on some twisty
>mountain roads.

That might be a hint. Have you put a shot of isopropanol in the gas
tank to make sure there isn't some water rolling around in there?

Another possibility is large flakes of rust from the tank. There is a
little cone-shaped plastic filter on the intake side of the fuel pump
that is designed to keep these flakes out of the pump mechanism.
Sometimes they can plug that filter intermittently, dropping your fuel
pressure.

A fuel pressure guage attached to the fuel rail might be a good
diagnostic.