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Jgreenwood.
I pulled out the sender last night before sunset. I was in a hurry and didn’t have much time before the light was gone. It went well enough though I think, but I didn’t have time to take any pictures.
I bought a new 740 Turbo Pre-Pump for $30 on the internet. This pump is an AC-Delco brand, and much heavier and taller then the original in-tank pump. As a consequence, I had to cut the outlet pipe of the fuel sender. I also went to NAPA and bought some halogenated fuel line (Gates 30R10 Submersible Fuel Hose 5/16’’) after the guy at the industrial fitting supply sold me air hose for gas line. It was kind of frightening actually, I looked up the hose datasheet after stepping into my car, and thinking that it actually wasn’t fuel line at all. Sure enough, when I called the counter guy on the fact that he sold me air hose for fuel line, he tried to argue that it would be ‘‘perfectly acceptable for fuel’’ and that he ‘‘sells it all the time’’ (Parker 7094). I try not to argue with idiots, because obviously he wasn’t going to be reasonable, and so I just got my money back. The Gates hose was $28 for a 12’’ piece. I thought it was expensive, but after looking at the hose I had used 2 years ago which had all but melted away, I was glad I did.
Anyway, I removed the sender unit and installed the new pump and filter sock. No more issue with cavitation at my main pump, It sounds really nice now, and I drove it around for a bit. It’s much better then that awful buzzing and gurgling which was going on before. BTW, pump lift is the difference in pressure between the suction inlet and the pump inlet. So, if you have a pump high on a pedastel, and it has to draw through a long small tube, it will generate a higher vacuum then if there was a short wide inlet tube. This high vacuum will load the pump more, but more importantly, it can actually boil some vapor out of the liquid itself. This is what causes that buzzing noise on the main fuel pump.
Email me if you want the link to the 740 Turbo Pre-Pump.
Goatman
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