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I just wanted to add to one of my posts about the pre-loading of the diaphragm assembly that wasn't being done. The pictures show the results of that missing procedure. I'm pretty sure the person that sent this M6903 in for rebuilding is a member here. I just wanted to also mention that this...

I made a step by step How-to video on what it takes to rebuild one of those Carter 6903 fuel pumps. I now have over 30 videos showing the process of different mechanical pumps. If you are the person that would rather do the rebuild yourself at home, or at work using one of the kits we make...

As I mentioned a few times, I used the lighter spring that will bring the pressure down.

I did both of yours today. Watch for a how-to video on it shortly.

Will do, thanks

I'm glad I was able to take care of this over-pressure misery on those 6903 pumps with a simple spring change. I did some digging around today and noticed that Carter's Super Street Pump is rated at 8+ psi. The 6903 was supposed to be rated at 5 1/2 to 6. I'm going to go out on a line and say...

Thank you all for the "welcomes". I think the first place I'm going to visit is the fuel pump thread.

The mounts I make are mostly for much older vehicles, with a few exceptions. I do go up into the 60's for the big block Mopars.

Hi all. As you can tell, my name is Mike, I am the guy that is helping out with the fuel pump problems people are having with the Carter 6903 putting out too much pressure. I am a rebuilder of mechanical things that can not be bought anymore. Hopefully I can help with any problems people might...