Do I have to use the $$$ Porsche Fuel Pump? 1971 911 T Targa

[Hi_Fi_Guy]

New to me 1971 911 T Targa with Zenith carbs has a leaking fuel pump. Porsche replacement is $810.00 from our host. Do I have to use the Porsche part or will another, less expensive, rotary style fuel pump work? I've had really good luck Carter brand rotary fuel pump on other air-cooled carbureted cars and wonder if anyone has tried that pump on an early 911? If not, what fuel pump works best on these cars?

This is an example of the type of rotary fuel pump I have used to feed dual webbers on my air-cooled Devin C. Thinking something like this might work well on the 911 T. Thoughts?
CARTER FUEL PUMP

[Hi_Fi_Guy]

Anyone try the one for cars with Weber carbs.? It is less than 1/3 the price of the Porsche fuel pump for Zenith carbs. Wonder if it would work with the Zeniths too?

[porsche930dude]

I dont see why not. I think id check the output pressure of the old one if its convenient just for reference because you know its running right at that pressure.

[zedsn]

I used an ebay low psi electric pump at under $35 for my 77 with weber carbs for a couple of years with no problem. I did have a good regulator with guage though to dial it in. It was a 5 psi max and I was at 3.5.

[ecostellodo]

This is what I used: Pierburg Low Pressure Fuel Pump from Zims Autotechnik.

I would call Zims or Beck's.

Beck's is in Scottsdale: http://beckseuropean.com/

[Avanti]

Different pump but Running a $50 one from Rock Auto on my 77 (as others here) with no issues. Had bad luck with a Carter as a cheap alternative for the original on my 78 Bentley which has carbs. Found a Nippondenso pump to replace it that has worked fine.

[juanbenae]

an after market unit is a must. will you be doing the work? fiddling around with an older car fuel system can be tricky. id suggest a set of needle nose vise grips with black tape wrapped around the teeth to cut off the rubber line from the tank to the FP before removing it. problem is if it's original rubber line that could spell the end of it by damaging it.

how bad is the pump leaking? how much gas is in the tank? is the car original or restored? if the pump is just a drop every couple seconds id back the thing outside, find the fuel delivery line to the rear and run the tank as dry as you can with the leaking pump before removing it. an empty fuel tank is always better to work with than a full tank. if you can pump it "dry" on an incline better yet. then when you level it the fuel will likely not make it to the outlet while you replace the fuel pump and any rubber lines or the dreaded line through the tunnel lines.

couple things lastly- find a fuel pump that will work best in the OE mounting hardware with the inlet/outlet orientation as close as you can get with the low pressure the carbs require will work best. old fuel systems are tricky. where do we end with the replacement of components after the current problem is addressed? correcting one problem reveals three more.

[Hi_Fi_Guy]

I will be doing the work. Replaced fuel line and pumps in other cars over the years so not too worried. Just wanted to be sure there was not some major reason I needed to stick with the OE Porsche pump.

[john walker's workshop]

I like the pierburg pumps. 912fpmp is the worldpac number. No regulator needed.

[Daves911L]

I've had good succes (like 100% good) repairing the old Bosch rotary cell pumps. There are o-rings that get old and cracked. If you are not a DIYer, check out the MFI threads on this forum and I'll bet you can find someone to repair it for you.

[Hi_Fi_Guy]

Thank you @Daves911L

[ddubois]

Originally Posted by Daves911L

I've had good succes (like 100% good) repairing the old Bosch rotary cell pumps. There are o-rings that get old and cracked. If you are not a DIYer, check out the MFI threads on this forum and I'll bet you can find someone to repair it for you.

The o-rings are easy to replace and can be purchased from Parker. I don't recall the sizes. The four long screws that hold everything together can be a little tough to crack loose. VERY IMPORTANT that you pay attention to the orientation of the intermediate plate with the roller impellers to the input/output cover where your hoses attach so that you put it back together correctly.

Tried a Carter for a while with a regulator and wasn't happy with it. Noisy and never seemed to hold a steady 3.5psi. You can get a new Bosch pump from other Porsche dealers for much less. That's what I finally did and have been happy with it.