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Posted by: stephestrad Aug 25 2015, 02:25 PM

The fuel pump on my '74 2.0 is no longer holding pressure and I'm looking to replace it. I've seen NOS pumps pop up occasionally on this forum , and various rebuilt units from retailers (Auto Atlanta, Parts Heaven, etc.), but I haven't seen any aftermarket replacement versions. Do they exist?

Posted by: 914Sixer Aug 25 2015, 03:06 PM

No aftermarket 3 port pumps at this time. Post a want to buy in the classified and see what comes up. I have several but I need to test them. Option 2 convert to the 75-76 pump.

Posted by: JohnBFR Aug 25 2015, 03:36 PM

It really seems that the best option these days is to convert to the later style pump. We just had another 3 port fail on a customer on the road today. We have bought a number of the AutoAtlanta rebuilt pumps, but an alarming number of them either leaked right out of the box or wouldn't build/hold pressure.

Posted by: JawjaPorsche Aug 25 2015, 03:56 PM

I converted to a two prong pump from a three prong pump three years and I have never had a problem.

Plus you can get a new two prong but not a three one.

NAPA has them.

Bosch Fuel Pump

Part Number. BSH 69133

Posted by: stephestrad Aug 25 2015, 04:36 PM

Interesting. Can you convert to the later, two pronged style without moving the pump up front? The threads I've read here all point to relocation.

Posted by: Shadowfax Aug 25 2015, 04:45 PM

Yes. I just did this a few weeks ago when my three-port pump took a dump and didn't relocate. If you reuse the bracket from the old pump, you'll find that it's too big. I was able to get mine to work by wrapping the pump with a piece of rubber. Also don't forget to get a new fuel filter (I think from a Super Beetle or Bus) and a new length of 12 mm fuel hose for the outlet from the fuel filter to the inlet of the new pump.

Posted by: JawjaPorsche Aug 25 2015, 05:24 PM

You do not need to move to the front.

Posted by: Dave_Darling Aug 25 2015, 05:42 PM

The fuel pump port that's missing from the 2-port ones is the return port. (It isn't really needed IMHO, anyway.) So you omit the line from the R port, and you omit the Y fitting that line goes to. So the return line goes straight from the fuel pressure regulator outlet to the return hard-line through the center tunnel.

For the inlet, you might have to do some "adaptor magic" to get the hose sizes to work correctly, but again that's not a huge deal.

--DD

Posted by: stephestrad Aug 25 2015, 06:58 PM

Looks like the two pronged style is the way to go, and more straightforward than expected! Thank you all for your help and speedy words of wisdom!

Posted by: 914Sixer Aug 25 2015, 07:54 PM

Use the rubber mounting pad from a the rear blower, it makes a nice shim and keeps the vibration down.

Posted by: RobW Aug 25 2015, 08:19 PM

I went from 3 port to 2 port, installed it on Dad's car (74) and never looked back. The 3 port is a dinosaur.

Posted by: porschetub Aug 25 2015, 11:46 PM

True,what do they rebuild?,there is no parts for them ,the AA ones will be a new coat of paint and others well...never heard of great stories about rebuilt ones what ever Porsche it is.
No point in trusted a used original could be good for a week or six months.
Any low pressure efi replacement pump will do as long as the inlet outlets are the same size,Bosch are good.

Posted by: euro911 Aug 26 2015, 12:42 AM

... but it's a good idea to move it up front, especially if you're not too concerned about your car not being a concours specimen. It will help to eliminate the possibility of pump overheating and vapor lock

BTW, are you running FI or carbs?

Posted by: JawjaPorsche Aug 26 2015, 05:28 AM

Moving the fuel pump to the front has been debated on this forum many times. From a personal standpoint I don't think it is necessary. I too suffered from vapor lock. Twenty years ago, I just moved the pump to the firewall and I have never had a problem since and we get some hot weather here in the south.

As far as finding a bracket to fit the two prong pump, I used an coil bracket that came with a new Bosch coil.

Love my stainless fuel lines from Tangerine Racing. They even had new rubber grommets too. If you go this route, you will need a reducer line from Tangerine so it will fit the fuel filter. The two prong pump takes a different filter than the three.


Attached image(s)

Posted by: RobW Aug 26 2015, 05:46 AM

The picture above is exactly what I did. What you don't see in the picture is the line wrapping over the assembly from the fuel filter.

I likewise moved the fuel pump to the front on a prior car, and had no need on Dad's car. The firewall install is fine. I used the stock fuel filter bracket and insulated the gap with neoprene.

Posted by: RobW Aug 26 2015, 05:47 AM

Also use the better clamps than the ones pictured.

Posted by: stephestrad Aug 26 2015, 07:09 PM

I have the original FI.

Posted by: stephestrad Aug 26 2015, 07:13 PM

Those are great ideas. I like both the firewall and coil bracket thoughts. Do stainless fuel lines have any cooling effect?

Posted by: Shadowfax Aug 26 2015, 07:25 PM

No cooling effect that I'm aware of but it is a good idea to replace the old plastic lines for peace of mind. I did mine as well as all the rubber fuel lines.