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Fuel Pumps - Topic Index

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The principles of pumping fuel may seem at first pass a simple matter. But the need to deliver on-demand flow with a constant fuel line pressure created some design challenges in the early days of the automobile. Solutions followed two basic approaches using either positive or non-positive pumping. Positive type pumps provide fuel continuously, requiring a separate bypass line to return fuel to the tank. Pumps of this type are less common with carburetors but were sometimes employed to deliver the higher pressures needed for fuel injection systems. For the Zenith or Solex carbs in our old Porsches, non-positive pumping is used – similar to most other cars of the time. Non-positive pumps deliver fuel to the carburetor only when it’s needed but keep the fuel line pressurized at all times. This is accomplished using a pump chamber that’s pressurized by a mechanically actuated diaphragm.

Reference Documents

Under Construction

Manual pages to be extracted and linked

Porsche Factory Workshop manual section
356B/C Version

Under Construction

Manual pages to be extracted and linked

Porsche Factory Parts Catalog section

Includes notations by Bill Romano

Articles

Fuel Filtering - Facts and Fiction - by Bruce Smith

Porsche 356 Registry V43 Issue 1

“You wouldn’t think of smoking your favorite pipe very long without a cleaning, yet the deposits you find in a pipe stem are mild indeed compared to the stuff you find collected, clogging and even passing through a long-neglected gas line filter.”

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Pump YOU up! - The Ins and Outs of Fuel Pumps (Part 1) - by Bruce Smith

Porsche 356 Registry V39 Issue 2

The principles of pumping fuel may seem at first pass a simple matter. But the need to deliver on-demand flow with a constant fuel line pressure created some design challenges in the early days of the automobile.

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Get It Pumpin' - The Ins and Outs of Fuel Pumps (Part 2) - by Bruce Smith

Porsche 356 Registry V39 Issue 6

If you're taking apart an old fuel pump, you'll probably encounter one of two possibilities. In the best of cases, you may find that it needs a bit of cleaning, maybe some flattening of mating surfaces, an inspection and basic reassembly with a rebuild kit.

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To be added:

Low Cost Fuel Priming Solution - the Squeeze Bulb

Installing An Electric Fuel Pump in a Pre 1962 Car

Installing An Electric Fuel Pump in a T6 Car

Fuel Pump Diaphragm Tool

Problem Using a Pulse Type Electric Fuel Pump

Making Your Own Fuel Lines

Videos

Forum Topic Links - "Best of the 356Talk Forum"

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356Talk - Carrera Fuel pump

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