Charlie - Thanks, and yes, you only have to get doused once on the truck pumps to know that they have way too much volume. I have consistently used the auto diesel pumps since that first dousing. It seems to me that a properly designed fuel system should allow you to insert the fuel nozzle in the fiiller tube, set the latch to the slowest fill rate, and expect it to shut off properly without a spill. This isn't possible with my tanks. I use the smaller pumps, pump fuel manually as slow as I can and I still get fuel blowing out the filler tube. I've started to use a small flash light to see into the filler tube and I'm learning to "listen" to the fuel to know when it is getting to the maximum level. This can't be even close to right. After some research and assist from other contributors, I'm pretty sure there is a major problem with the venting in my tanks. Thanks again for the comments.