GASKET FUEL PUMP TO BLOCK
WO638737
Fuel pump to block gasket
For Willys 134ci L-head and F-head engines
Essential seal between mechanical fuel pump and engine block for all Willys MB, Ford GPW and civilian jeeps fitted with the 134ci engine. This gasket prevents fuel leakage and ensures correct fuel pressure. Suitable for both early chain-driven and late gear-driven engines.
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Engine type Willys 134ci L-head (Go Devil) and 134F F-head |
OE number 638737 |
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Application MB, GPW, CJ-2A, CJ-3A, CJ-3B, M38, M38-A1, M170 |
Function Seal between fuel pump and block |
Features
- Fits all Willys 134ci L-head and F-head engines
- Replaces original Willys-Overland part 638737
- For mechanical fuel pumps with and without vacuum pump
- Suitable for WWII military and post-war civilian models
- Essential when overhauling or replacing fuel pump
★ Correct reproduction to original specification for authentic restorations and reliable maintenance of your historic military vehicle.
Application
Willys MB (1941-1945), Ford GPW (1941-1945), Hotchkiss M201, Willys M38 (1950-1952), Willys M38-A1 (1952-1963), Jeep CJ-2A (1945-1949), Jeep CJ-3A (1948-1953), Jeep CJ-3B (1953-1968), early CJ-5 (1955-1971) and M170 — all vehicles fitted with the Willys 134ci four-cylinder engine (L-head or F-head variant).
Installation notes
When fitting, install gasket dry or with a thin layer of gasket sealant. For easier installation: rotate crankshaft so fuel pump eccentric is at its lowest point. Use two new gaskets with spacer between them (one gasket-spacer-gasket). Tighten bolts evenly in a cross pattern. Note: some models (such as M38) use special bolts with extended hex for easier removal.
Compatibility
This gasket fits ALL Willys 134ci engines, both the L-head 'Go Devil' (MB/GPW/early CJ-2A/M38) and the later F-head variant (late CJ-2A/CJ-3A/CJ-3B/M38-A1). No difference between early chain-driven or late gear-driven timing — this gasket is identical for both. Fits pumps both with and without integrated vacuum pump for windscreen wipers.
Historical context
The mechanical fuel pump was a crucial component of the Willys 'Go Devil' fuel system, driven by an eccentric on the camshaft. This simple yet reliable system served from the first Willys MA prototypes in 1941 well into the 1960s on civilian CJ models.
⚠ Spotted an error in this description? Report it to info@willys.be
This part is intended for the restoration of historic military vehicles. Fitting, aligning, deburring or reworking is part of that work and is inherent to the nature of these goods. Dimensional variation also exists between original vehicles.
Installation requires technical knowledge of the vehicle. Unsure whether this part suits your version? Ask us before purchase at info@willys.be.
ALL_CATEGORIES : Fuel Pump Willys MB Ford GPW, Sealings&Accessoires CJ2A, Fuel Pomp CJ2A, Sealings&Accessoires CJ3A, Fuel Pomp - CJ3A, Sealings&Accessoires M38, Seals Oil Water engine, Fuel Pomp M38, Fuel Pomp - CJ3B, Sealings&Accessoires CJ3B
This part fits:
| Model | Years |
|---|---|
| Military jeeps | |
| Willys MB (early) | 1941, 1942 |
| Willys MB | 1942, 1943, 1944, 1945 |
| Ford GPW (early) | 1942 |
| Ford GPW | 1942, 1943, 1944, 1945 |
| Hotchkiss M201 (early) | 1956, 1957, 1958, 1959 |
| Hotchkiss M201 | 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966 |
| Willys M38 | 1950, 1951, 1952 |
| CJ series | |
| Jeep CJ-2A | 1945, 1946, 1947, 1948, 1949 |
| Jeep CJ-3A | 1949, 1950, 1951, 1952, 1953 |
| Jeep CJ-3B | 1953, 1954, 1955, 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968 |
📐 Diagrams & technical drawings
From the original Technical Manual CJ2A_PL_1949 — Parts List — only for Willys CJ-2A / CJ-3A (1949)
From the original Technical Manual TM 10-1513 — Maintenance Manual — only for Willys MB / Ford GPW (1942)
