356 ELECTRIC FUEL PUMP INSTALLATION
THIS WAS AN ARTICLE PUBLISHED IN PCA POTOMAC's POTOMAC'S DER VORGANGER.
356 Electric Fuel Pump
By Mat De Maria
The 356 model Porsche was manufactured from approximately 1950 to 1964. After many years of use, some parts of an individual car would wear out, with the result that many of the functions that a car is supposed to do would degrade in quality. One of the most annoying problems with these high mileage (or unrestored) cars is the difficulty in starting the engine. The solution is generally two-fold:
The first part of the solution is to clean all the battery terminals and grounds of the 6 volt system. This includes on the 356 Bs and Cs, reconfiguring the battery ground. As delivered by the factory, the battery ground is connected to the bolt at the base of the hold-down bracket. When the cars become rusty, this ground is tenuous at best. It is far more effective to weld a nut or stud to a solid part of the body and to connect the ground cable to this. In addition to this fix, as a matter of protocol, install new distributor points.
The second part of the solution is to enable the fuel to reach the carburetors quicker in order for the accelerator pumps to work sooner. On an old car, the fuel pump is usually worn and is not working as efficiently as a new pump. The worn fuel pump is usually taxed with the job of drawing fuel through a partially clogged gas tank petcock and/or through a partially clogged tunnel fuel line. The quick interim solution is to install an electric fuel pump. This is in lieu of immediate renovation and/or replacement of the petcock, fuel line, or stock fuel pump. This is also added insurance for a restored car to ensure its reliability, especially when it is not driven for long periods.
The best choice for a 6 volt vehicle is the Bendix fuel pump. See Picture #1.
This pump has a good reputation, well known for its reliability for at least 35 years, and it is even still available through any NAPA outlet.
This area is chosen because it is near the fuel line in the tunnel and it is a protected area from rain or dirt. It is normally mounted on the vertical bulkhead wall. Remember it has to clear the floorboard that rests above it. For those cars (such as the one in the illustration) with the tar sound deadener paper still on the wall, cut a rectangle from the wall the size of the base of the fuel pump. A sharp chisel is used here to cut through the paper with just hand pressure. Place pump against the wall in the chosen spot that has had the tarpaper removed and mark the centers of the mounting flange holes of the pump with a punch. See Picture #3 where the sound deadener has been cut out and the pilot holes have been drilled.
In this application a 'Nutsert' for a 6mm thread size was chosen. Since the pump carries its ground through the case and mounting flange, care must be exercised to ensure that the ground will not be affected by long term corrosion. A chisel-pointed lockwasher is placed between the pump flange and a ring connector. Both are underneath a 6mm mounting bolt. See Picture #5 for a view of the chisel-point lockwasher mounted on the attaching bolt.
The power supply wire connects to the pump power wire by means of a standard blue butt connector. This in turn is connected to a Bakelite fuse holder that holds an original style ceramic fuse. The other side of the fuse holder will lead to a Porsche bullet connector wired to terminal 15 at the ignition switch. In this particular application, sheathing was installed onto both the power and ground wires from the pump for a short distance, and an Adele clamp fastened this pair to the bulkhead wall by an 1/8" rivet.
See Picture #7 to see how this was done. The power line is then led through a gronimeted hole in the upper part of the bulkhead brace.
At the time of this update 9/06 AC Delco still makes a very nice reliable 6v pump P/N EP11 (OR GM P/N 6414670)
NAPA sells a 6v pump under their P/N P4259 or under their non-Napa number P/N E8011. (Airtex, Carter, or Federal Mogul)
Performance Products still sells a 6v pump which visually looks like the carter (NAPA).
This is a picture of the Airtex (Napa) pump installed with a pressure regulator to reduce
the 5 psi pressure to a lower amount for the 32 pbic's