Hi, I own a stock 95' Mazda B2300 and have been working forever on solving my fuel gauge issue. When I bought the truck the fuel gauge did not work and read below empty. I have a bunch of spare B-series parts and have changed everything and tested everything I could possibly think of. I have installed a new fuel pump and sending unit. Tested the fuel pump and rheostat on the sending unit and it cleared the test. I tested the grounds in the back of my truck and even tapped into two of the grounds for my fuel pump and sending unit and ran the extra grounds into my truck frame. I took out my ground harness that grounds my battery to the frame, body, and upper radiator support, and even tested it for continuity in all places imaginable. I even replaced my anti-slosh module. All my gauges are acting correctly. Is there a test for my actual gauge and or does anyone have any helpful advice for this issue? Thank you.

 

I had trouble with the guage on my 93, I know I can go 300 miles to a tank, so rather than mess with it, I just set the trip, and fill up around 280 miles.

 

Thanks, I'll keep that it mind. I just tested my anti-slosh module for continuity and everything seemed to be okay. I'll just have to take the anti-slosh module I have in my truck now (the one in there now is from a 94') and see how the gauge reacts with no slosh module in it.

 

It turns out that unless you bypass the anti-slosh module, the truck will not want to run. If you can succeed in this then you will have a working fuel gauge except your gauge will bounce around when going over bumps, etc. When I first started researching this issue I noticed that I got a different reading for a fuel level either when I used the anti-slosh module from my 94' Mazda B2300, my 95' Mazda B2300, and even when I had no anti-slosh module at all.

Next I called my local Ford dealer and I asked him if the module from my 94' and 95' were interchangeable. He said yes. After tons of frustration I called a few more Ford dealer ships and Mazda dealerships and discovered that the module had changed in design a few times. My 95' Mazda B2300 could only use a module from the years 95' or 96'. This is why it is always good to have more than one source for information.

The part turns out to be discontinued. Which is understandable in a way. I also discovered it was worth $423.00 which doesn't make sense because motherboards typically don't even cost that much. So I went to the salvage yard and got a anti-slosh module with a instrument cluster for $50.00. I installed it today and as you may already know. I can finally tell how much fuel I really have.

 

In my 95 the fuel float had a pinhole in it and would fill up with fuel and sink to the bottom of the tank causing the guage to read empty. Dont know if that could be your problem but it wouldn't surprise me.