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...

[stephestrad]

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.

Apologies for reviving an old thread, but this quote about "properly maintained" cars was interesting. I'm experiencing what appears to be classic vapor lock on my '74 2.0. For instance, the other evening after 30 minutes of driving up in the Berkeley hills, I pulled over and spent about 15 minutes watching the sunset. I'm new to the 914 experience, so I'm still learning the sounds, but when I tried to restart the car, it appeared that the starter cranked the engine over, but the engine wouldn't catch. I let the car cool down for an additional 40 minutes, then she fired up. The engine ran a bit roughly for a few minutes -- by this, I mean each time I came to a stop sign, the idle dropped so low that the rpms were barely registering on the tach and the car vibrated enough that I thought she might die out again -- but, by the time I was home, she was purring as normal.

My car has been pretty well maintained (and generally runs well), so I'm curious, if the original fuel pump placement were not the problem, are there specific parts of the car that should I check? Are there maintenance elements that I may have overlooked, but would result in the same symptoms as vapor lock?

Btw, I'm going to try and test the concept of this being vapor lock this weekend. My plan is replicate the problem, then pull the fuel hoses off the injectors and see if I have liquid fuel, or just vapors. Are there any other recommendations for testing vapor lock?