 For Series
1 and Series 2 E-Types, the fuel filter used was AC7950001, a glass bowl
filter that was used on hundreds of production models by any number of
manufacturers. The original filter element was a gauze screen, Jaguar pn
7299.
Gauze Filter (all S1)
For the entire S1 production run, the fuel filter was a simple wire gauze, which fit in the top of the filter bowl. Fuel enters through the center hole, and flows back out through the gauze. Trapped particles remain in the glass bowl and are visible to an observer. These gauze elements are widely available as pn 7299. It's a simple system, and completely adequate. But the gauze has a small surface area, and low efficiency. So this simple screen was replaced early in S2 production. The filter head remained the same, and the later filter element is fully compatible with the S1 cars. GF124/FS2 (S2, retrofit S1)
The above illustration is the original pattern of GF124. I include several pictures, because the part has been changed in construction, but not in function. The same pn continues to be used. This is a ceramic element. It works just like the mesh screen: fuel enters the glass bowl through the center, passes through the hollow ceramic and passes out through the top of the element. Particles filtered out remain visible in the glass bowl. It has the advantage of much larger surface area and greater filtering efficiency compared to the wire gauze. Be aware that if you order a current GF124, you will likely get something like this:
If you are interested in a "concours" look, the original GF124 has been reproduced in sintered bronze for the Corvette crowd, and is available from Corvette Central (click here).
Regardless of which version of the GF124 you choose, the fuel flow path is the same. Fuel enters through the center into the glass bowl, passes through the element from the outside in, moves out through the holes at the top and into the carburetor feed line. Trapped dirt will be visible in the sight glass:
When using any of the newer elements, you should order a gasket pn 7298, from one of the usuals. These "official" gaskets are slightly wider than the ones now packed with the filters, and do a better job of sealing. The gasket should be pushed down over the filter, so that the filter is held in place by the gasket when the glass is installed. Another good alternative is Felpro 773, which is a cork gasket designed specifically for this application. You can find it at local autoparts stores or Rockauto.
"C28080": confused beyond redemption If you are ordering a filter for a Series 1 or 2, you shouldn't order a C28080 unless you have verified it's an old stock example, and looks exactly like a ceramic GF124. Unfortunately, the item widely being sold with this part number is a Series 3 filter, designed for reverse flow. It will work, but the impurities will be trapped inside and not visible through the glass. Jaguar has done the community a great disservice by adding this abiguity to an already confusing item. Series 3: Reverse flow glass bowl filter As mentioned, these filters weren't Jaguar-specific products. In many applications, the configuration of the engine compartment required that the position of the inlet and outlet connections be reversed. This was the case for the Series 3 E-Type. The filter head works fine for these applications, but the filter that should be used in this case was GF149 :
This element allows incoming fuel to flow in around the outside of the ceramic. It passes through the ceramic filter and out through the center. Current production of this element is also paper: 
Series 3: Steel Bowl filter
After cars 1S51617, 1S74312, 1S1665, 1S21662, Jaguar switched to a steel bowl fuel filter, staying with reverse flow. The correct filter element for this was ACD60, confusingly given Jaguar pn JS660. It should look something like this:
Interchanges Series
1
Series
2
Series
3, Glass Bowl
Series
3, Metal bowl
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