I finally completed the pump tear down I promised back in the late fall when Benjamin and I were working through his fuel pump supply issues. I took pics of the complete process and found answers to some of our questions about these stock pumps. It was a fascinating process. For the sake of continuity, the link to the original thread is here >>>> https://www.ford-trucks.com/forums/1...-and-pics.html.

NOTE... these pumps cannot be rebuilt or repaired. The only way I could do this little project was by destroying the aluminum housing, and I see no way around that issue at all.

The compiled PDF is attached below. In the PDF, I included a link to my Dropbox where I have the full size photos in a folder if you want a closer look at them. If the link doesn't work by clicking on it, just copy it into your browser and it should work "manually". At the same time, though, I cannot access my Dropbox account at all from my laptop at the office due to the company security protocols.

Enjoy!!

 

Awesome. Amazing that it's taken 15 years for someone to do this. Ha! Neat to see, thanks for putting in the effort!!! REPS TO YOU.

 

Reps! Excellent write up Pete, I borrowed a pdf copy for my 7.3 archive.

You measured the internal screen as 64 mesh? That's somewhere between 210 and 250 microns based on a quick google search. For comparison sake that's about the same as the Racor PS120-02 (listed as 200 - 260) while the popular Baldwin BF7725 is 125 microns, and the dumkopf Fram G3 I'm running is 10 microns.

So who's going to tear open one of those $40 fleabay specials?

 

Thanks, guys. No reps are really necessary. Just glad I could do it. Remember, though, that the Racor PS120-02 has much more screen surface area than that little booger inside the pump housing.

 

Nice work. Hope you held onto that screen. It would really be interesting (to me at least) to compare the size of the openings in the mixing chamber filters to the size of the screen openings in the fuel pump.

Kind of makes a good case for a pre-pump filter regardless of intank mods or not. Also makes me feel better about that cheap little 100 micron filter I have pre-pump.

 

Well, Chris, since I have the pictures, I tossed the screen because the pliers slipped when I first tried to remove it and punched a tiny hole through the fine wire mesh. Knowing what the mesh size is, though, will still be useful info for that comparison.

The only thing we need is for someone to get me one of the mixing chamber screens for the comparison... the ones in all three of my 7.3's already have been removed. I am seriously thinking about selling my existing 2WD F250 this summer and replacing it with another 7.3 with fewer miles and 4WD... if that happens, I'll most likely get another chance to do the comparison. My gut feeling, though, is that the screen in the mixing chamber will either be the same as or will have larger openings than the one inside the pump.

If anyone who reads this happens to still have their mixing chamber, I'll gladly reimburse the shipping cost to send it to me for a tear down and comparison.

 

Thanks for taking the time. Very interesting and informative, and thorough. Reps for sure.

 

Excellent as usual Pete!

 

Great job! I was curious about this. I replaced my fuel pump after I installed my prefilter, so I imagine my screen is going to stay very clean for years to come.

That coil is an electrical noise suppressor - think of it as a post-filter to prevent electrical "debris" from reaching the vehicle power. DC motors with brushes are extremely "noisy" on an electrical circuit, and it can do weird things to everything from your radio to your PCM.

 

Thanks Pete!

I was one of those eagerly waiting for your forensic disassembly of the stock fuel pump. I linked your thread to my old thread on steel fuel tank delamination:

Ford Painted the Inside of the Fuel Tank ! ???

https://www.ford-trucks.com/forums/1...fuel-tank.html

 

Like the windshield wiper motor! One of these days I'm going to install a radio noise filter into that circuit!

I would think the heater box blower motor would also be a good candidate for one.

Pop

 

Reps !

 

There should be something in the motors to prevent this... you might have a loose ground somewhere.

 

If you meant me, my truck hasn't got a problem, and works as advertised.

I'm opting for noise filtration only as a preventative measure.

And yes, I keep the grounds clean and tight.

Pop

 

Your teardown reminds me of how many places an enterprising company could 'cheap out' on such a pump. Makes me want to get the best one out there! Thanks - great .PDF file of your teardown.