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(888) 312-8812 Login SignupFuel is the lifeblood of any engine, but not all fuel is pure. The Donaldson Fuel Filter is the ultimate defender, blocking out contaminants before they can infiltrate your fuel system. Created with high-efficiency cellulose media, this spin-on filter captures particles and water, preventing engine damage and maintaining peak performance. Inconsistent filtration leads to inefficient combustion, reduced fuel economy, and costly repairs—none of which belong in a well-maintained machine. At 8.94 inches, the Donaldson P550959 is made to fit perfectly and perform flawlessly, offering unmatched protection against everything the road throws at you.
| Length | 8.94 in |
| Efficiency 99% | 16 micron |
| Efficiency Test Std | SAE J1985 |
| Gasket Id | 3.86 in |
| Gasket Od | 4.33 in |
| Media Type | Cellulose |
| Outer Diameter | 4.65 in |
| Style | Spin-On |
| Thread Size | 1 1/16-16 UN |
| Type | Secondary |
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