Fuel Pump Seized

[Ryce Stallings]

I have a 77 911 with an SC engine. My gas tank started to leak so I replaced it with one from Dansk and installed anew Bosch pump. I cleaned the tank with gas before I installed it. The car was then stored for five months. I filled the tank and put in Stabil gas stabilizer. I started driving it again and have been stranded twice with the fuel pump not running. My mechanic replaced the electrical portion of the ignition switch. The car ran one day and then stopped again. My mechanic says the fuel pump is seized.

Any idea of what is going on, do new pumps ever fail?

[Jack Stands]

It seems many manufacturers are moving production to cheaper labor markets with associated quality issues arising from the move, so it’s entirely possible that a new pump may fail. Average time to failure is a measurement that manufacturers use in evaluating their products, so they realize they don’t last forever.

[ClickClickBoom]

Gillette plan, give them the razor, sell em the blades. Airbus was one of the first mega corps to implement. Planes are dirt cheap, parts are breathtakingly expensive. The auto industry has followed, sell the car, offer 5 years parts and maintenance, they fix the car with 3rd world manufactured parts(cheap). If you are dumb enough to keep the car, they sell you, or the next owner parts at royal prices with killer mark up.

[BoxsterGT]

The replacement Gas Tanks from Dansk do NOT have a pre-filter screen as the original Porsche Tank did. There are lots of posts here on Pelican about this. Just search this board for Dansk Tank.

Without this screen many have seen pump failures.

I offer a Pre-Filter for this tank.......


...that uses a Setrab 100 Micron filter w/ Modified AN fittings and E-85 Rated M12 Fuel Hose with the good Norma Clamps to match the Tank and Bosch Pump.

I can send just fittings or any part of this if you want to source your own Filter.

For info, please email me ONLY.

Len.Cummings at verizon.net

[Ryce Stallings]

Can anyone confirm what BoxterGT just said. This was a new gas tank on its second tank of fuel.

[Walt Fricke]

Boxster GT fills a very useful niche in our DIY Porsche world. His parts are reasonably priced. He doesn't hype his products. From the information he supplied you could easily make something like this yourself.

I'd be just as astonished as you are about the rapid failure here. Lack of a screen would seem only to matter if there is junk in the fuel tank. And you did something which wouldn't have occurred to me - wash it out with gasoline first.

I once took a failed fuel pump apart, but can't recall if it had its own small internal screen or not. The failed one I disassembled did not seem to have obvious wear, and when temporarily reassembled spun nicely when power was applied. But the car worked with the replacement. You (the average DIYer like me) can't reseal these pumps, but it is worth disassembling before throwing away, just to see what can be seen.

I don't know if a filter will prevent pump #3 from failing way prematurely, but adding an inexpensive filter seems like an inherently good idea.

[Ryce Stallings]

The tank comes with a sticker that it is shipped with anti corrosion coating that needs to be washed out. My mechanic says he hasn’t ever cleaned one but I did. I did a search and found one thread about a pump failure with a new tank. The failure was blamed on metal filings from the manufacturing process. I also think BoxterGT’s filter is a good idea.