[Grady Clay]

I think the screen filter should be removed and cleaned periodically. Unless it is damaged, it should last longer than any car.

Cleaning the filter lets you assess the debris condition of the tank. If there is gunk in the bottom, clean it out. Once the gas is drained, you can remove the plugs, screen filter and fuel level sender. This lets you use a garden hose and dish soap.

I have seen screen filters that appeared good (able to pass gasoline) but were plugged. The screen can be covered with fine rust particles where the weave of the screen is still very prominent. Aerosol carb cleaner from the inside works well.

The screen filter fitting comes with two different size pipes to fit either 7 mm hose or 9 mm hose. I’ll see if I can find the part numbers.

When I put the old screen filter in the gas heater supply port, it dispersed the return fuel, not stirring up the sediment in the tank bottom. The Factory plumbing returns the fuel to a banjo and banjo bolt that replaces the drain plug. This stirs up any debris and water that collected at the lowest point – by the drain plug / fuel return port. I think the rationale was to stir the fuel letting the debris go to the fuel filter and the water to the engine. This prevents water filled sludge build-up on the bottom of the tank.

To not confuse things, we are talking about ONLY cars 1973 and earlier (not ’73.5 CIS). The 1973.5 and later cars use a different system with a different filter screen.

Best,
Grady