JOHN DEERE:
• John Deere 644B/646/743A/743 3.179D (1978-1990)
• John Deere 1032/1055/1065/1072 3.179D (1978-1990)
• John Deere 925/932/952/955 3.179D (1978-1990)
• John Deere 965/975/985/850 3.179D (1978-1990)
• John Deere 950/1050 3.179D (1978-1990)
IMPORTANT:
12V electric fuel pump for the vintage John Deere 3.179D engine (2.9L 3-cylinder diesel). This is an older engine family found in compact construction equipment from the late 1970s through early 1990s: 644B loader, 646 compactor, 743A skid steer, 1520 tractor, and similar models.
Failure symptoms: no fuel delivery, hard starting, engine dies under load, loss of prime overnight. On vintage JD equipment, fuel line wear (cracked rubber hoses) causes air leaks that mimic pump failure. Inspect all suction-side hoses and fittings before condemning the pump. Wiring connections on older machines often corrode — clean and verify 12V supply at pump connector. Due to equipment age, consider replacing fuel lines and filter simultaneously.
⚠️ Verify AZ27951 part number — vintage JD fuel system parts vary by serial number break.
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