Have a code 43, fuel supply system. Anyone ever run into this issue? Just started getting this code. Normally when the car is at operating temp. Most of the time it is when I am below half a tank. Not sure when the fuel filter has been replaced, so I might do that first.

 

It has - thousands of times... It really helps to search...

https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/code-43-bad-mpg-bad-fuel-smell-2989615/
http://www.htarchive.net/showthread.php?t=2982099

This is just the beginning...

 

Thanks for the point in the right direction. My search pulled many topics not even related.

 

I have had this code, swapped the o2 sensor. Or could be your fpr.

 

I am going to go with the O2 sensor since I have bad piston rings at this time. Still putting the other motor together so that I can swap them out.