Cummins/Onan — Cleaning LPG Fuel Filter
Maintenance · liquid LPG fuel filter
From a Cummins/Onan operator's manual — check it applies to your exact model before use.
Applies to: Cummins/Onan NHEL
Before you start
- Kerosene presents a hazard of fire or explosion that can cause severe personal injury or death.
- Liquid LPG presents a hazard of fire or explosion. After assembly, check for leaks using a soap and water solution.
Parts for this job
- 149-2279 Fuel filter Amazon eBay $26.93 KuduParts $31.00 FridayParts $33.04
Part numbers from the service-parts list for Cummins/Onan NHEL. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Remove the four capscrews and lock washers securing the filter bowl to the filter body.
- Separate the filter bowl from the filter body and discard the O-ring seal.
- Remove the nut and washer from the center stud and pull out the filter element.
- If the element is clogged, wash it in kerosene and blow dry with low pressure (30 psi or 207 kPa) compressed air; replace if damaged.
- Wipe the center stud magnet clean of rust or scale particles; do not tap the magnet clean.
- Install a clean filter element using new gaskets (2) and securely tighten the center and stud nut.
- Place a new O-ring in the filter bowl sealing groove.
- Align reference marks and install the four capscrews; tighten 56 to 74 in. lb. (6.5 to 8.3 N·m) torque.
- Pressurize the fuel system and check the filter for leaks with a soap and water solution.
Specs & values
- Capscrews 56 to 74 in. lb. (6.5 to 8.3 N·m)
- Compressed air 30 psi or 207 kPa
Full service-parts list: Cummins/Onan NHEL →
Source: Cummins/Onan operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.