I know this is an old thread but just wanted to add something to it that I remember from the 60/70's I have run Carter and Holley fuel pumps for years. I am not sure if I remember reading about mounting them near the tank back then and always had them under the hood. I do remember on the instruction on a Carter I think that it would have more pressure if installed with the fittings down. Have any of you ever did that or read it in the instructions? The fuel pumps that I have had forever and always worked when I just needed one to start a motor or siphon gas out started quitting within the last few years but they had been in my shop on a shelf from the 80's. After reading the post on here I just wonder if the crappy gas we have with the dag corn in it is why they went bad after all that time? I just had a factory rail mount one that came off a late 80's Ranger that I had used for a while on my XJS so I could move it if need be until I bought a proper pump. That was maybe 3 or 4 years ago. I had used it for some testing a few weeks ago and it pushed water at 75 lbs. That is higher than I expected for what it was used on? I made sure it was all dried out and sealed the ends and put it on the shelf. When I wanted to use it the dag thing would not even fire up? Did I kill it with testing with water? That is real hard to believe but just might be the case? As many years that I had used the electric pumps on all brands of carbs including factory old style Ford ones I have never had to buy a regulator for one. But in the early 90's my son's fuel pump went out on his 4x4 429 from hell go mudding and have fun truck so he bought a Holley and mounted it under the hood and the thing pushed right past the floats and few days later??? as luck would have it he got the truck home and with out a lot of gas getting on the motor and our friend next door had a spare regulator and we installed it and think set it to maybe 7 lbs? and no more problems. But why did that pump work great for a few days and then raised the pressure or did it hit the floats so hard that they got weak? I never had that problem before on the olders ones. Just maybe he bought a Hi Pro one and didn't know it or they had made a lot of changes from my days when they were made for carbs and with fuel injection being used they increased the pressure of them maybe? I can say one thing for sure and that fuel pumps have gone out of sight it looks like now. The $20 fuel pump that the guy said he bought from NAPA back in 2011 seem to be triple the price now. Well I have learned a lot reading all the post so thanks to all.