Tuesday, October 29, 2013
How to Install Mechanical Fuel Pumps
The fuel system on older vehicles is a simple low-pressure system. At the heart of that system is the mechanical fuel pump. The mechanical fuel pump is a spring-loaded diaphragm fuel pump. It mounts to the engine block and pumps when an eccentric lobe on the cam moves the pump lever up and the pump spring forces it back down. Most mechanical fuel pumps attach to the engine block with two bolts, one on each side of the pump lever. These pumps connect to the fuel tank with one line and another line goes to the carburetor.
Instructions
- 1
Loosen and remove the two fuel lines from the mechanical fuel pump, using a 9/16-inch wrench. Use a screwdriver to remove the hose clamps if the fuel line is clamped on. The fuel line from the tank must be temporarily plugged to prevent leaks.
2Slide a small piece of fuel line over the line coming from the fuel tank and insert a 3/-8-inch bolt into the open end of the fuel line to prevent any leaking.
3Loosen and remove the two bolts that hold the fuel pump to the engine block and remove the pump.
4Scrape the old gasket from the mounting plate and use gasket cement to glue on a new one. Let the gasket cement set before attempting to replace the pump.
5Slide the chrome push rod back up toward the camshaft on Chevy engines. (For non-Chevy engines, go to Step 6.) The rod is located inside the hole where the fuel pump bolts on. Insert the pump lever of the new fuel pump into the mounting hole before the push rod slides back down and blocks this task. Thread both mounting bolts into the threaded mounting holes before tightening them.
6Insert the pump arm into the fuel pump mounting hole on non-Chevy engines. Line up and thread both mounting bolts into the threaded mount holes, before tightening them.
7Reattach both fuel lines. The fuel lines should align with their respective line fittings. Be sure to tighten the lines to avoid any leaks.
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