73 fuel pump mounting question, It has been too long !!!!!!! Options

[David_S]

I started tinkering with my project again a few days ago, and am in the process of getting the engine bay back together. Only problem so far is I had to replace the right engine shelf, and I cant remember how the fuel pump mounts ! I attached a pic of the area where the Haynes manual shows it to be, but the pic in the manual isn't the greatest. Also in the pic, what mounts in the slotted J shaped bracked above the motor mount? It has been too long ago since I tore this thing apart and I screwed up and didn't take enough pictures !!!!!! TIA

[ConeDodger]

In a properly maintained car you should not experience vapor lock. I suspect that Porsche relocated the fuel pump because they couldn't count on people properly maintaining their cars. In the back it is close to a source of heat and possible ignition for those cars that owners maintain poorly.

At the pressure in an EFI system vapor lock shouldn't occur with a properly maintained vehicle. It is easy enough to relocate if you have the proper mount but a pain to replace it and the fuel filter.

That said, mine is up front. But it came that way...

[Dtjaden]

In 1973 I had a new 914. I was in Minnesota at that time. It would vapor lock frequently whenever the temp went above 85. My solution at the time was to install a second low pressure pump in the front trunk. So it was not just maintenance issues that caused the problem.

Never a problem with my new 1976. I would put the pump in the front as I am going to do when I convert my current 73 back to FI.

In a properly maintained car you should not experience vapor lock. I suspect that Porsche relocated the fuel pump because they couldn't count on people properly maintaining their cars. In the back it is close to a source of heat and possible ignition for those cars that owners maintain poorly.

At the pressure in an EFI system vapor lock shouldn't occur with a properly maintained vehicle. It is easy enough to relocate if you have the proper mount but a pain to replace it and the fuel filter.

That said, mine is up front. But it came that way...

[KELTY360]

In 1973 I had a new 914. I was in Minnesota at that time. It would vapor lock frequently whenever the temp went above 85. My solution at the time was to install a second low pressure pump in the front trunk. So it was not just maintenance issues that caused the problem.

Never a problem with my new 1976. I would put the pump in the front as I am going to do when I convert my current 73 back to FI.

In a properly maintained car you should not experience vapor lock. I suspect that Porsche relocated the fuel pump because they couldn't count on people properly maintaining their cars. In the back it is close to a source of heat and possible ignition for those cars that owners maintain poorly.

At the pressure in an EFI system vapor lock shouldn't occur with a properly maintained vehicle. It is easy enough to relocate if you have the proper mount but a pain to replace it and the fuel filter.

That said, mine is up front. But it came that way...

I bought a new '73 1.7 in July of 1973. I drove about 600 miles, took it back for the initial dealer maintenance service and then left from SoCal on a trip to Colorado. Over the course of that amazing trip with my new Porsche I experienced numerous occasions of vapor lock, stranding me in random places for about 30 minutes before it would run again. When I got home and called the dealer, they said, "oh yeah, we know exactly the problem. Bring it in and we'll fix it up." I'm not sure what they did, but I now suspect they relocated the pump under the tank. Never had a vapor lock problem again. My problems had nothing to do with owner maintenance, just a design flaw that the dealer was well aware of and easily corrected.