I'm having some fuel/vacuum probs.
 

I was told maybe somebody here could help me.

I have a 92 Mazda B2600i 4x4. What happens is when the truck gets to a certain level in fuel it gets to where when you accelerate it will sputter and stall like it's getting no fuel.

It first started at a quarter of a tank. I just thought my fuel gauge wasn't right. Then it did it at half a tank, so I thought I was low again, so when I refueled it only held about 5 gallons which means my gauge was right. It is usually after it warms up a bit when it does it. Now it's getting to where it will occasionally do it at 3/4 tank full.

I thought fuel filter, but that doesn't make any sense b/c when it's on a full tank it runs fine.

I don't know where to start. Any suggestions will be very much appreciated

Welcome to the only family Ford Truck site, on the net. If you have a minute check out the Guidelines, it will help you to navigate through FTE.
Enjoy FTE :-X22

Another "welcome" to FTE.
You have landed in the Alabama Chapter forum. Perhaps someone here can help you, but I'd check out the rest of the site and see if you can find the proper forum for your specific technical needs.
Best of luck with your problem.