Fuel Pump Plunger & Gravity Parts Guide
By Therm-a-Rest® - Sleeping Pads, Bags & Outdoor Comfort | Published: 2026-10-24
Category: Buying Guides
Learn when to replace your fuel pump plunger, gravity water filter elbow, or tent parts. Get clear decision rules and fit guidance for MSR and Platypus gear.
Quick answer
Replace a worn fuel pump plunger to restore stove function, swap a cracked GravityWorks elbow to fix dirty water flow, and use genuine Hubba Hubba parts for tent repairs. Each part fits specific models, so check compatibility first.
Why these parts matter
Small failures like a stuck plunger or a leaking elbow can stop your stove or water filter from working correctly. Replacing just the worn component costs less than buying a whole new system and keeps your gear out of the landfill.
Genuine replacement parts from Therm-a-Rest® and MSR are designed for a precise fit. Aftermarket parts may save a few dollars, but they often require modification or fail sooner.
Trade-offs to consider
The Fuel Pump Plunger Assembly is inexpensive and easy to install, but it only fits MSR liquid fuel pumps. If your stove uses a different pump design, this part won't work.
The GravityWorks 90 Degree Elbow is a small plastic fitting that can crack over time. Replacing it is simple, but you must ensure it matches your dirty water tube connection—it fits Platypus GravityWorks, MSR AutoFlow, and MSR Trail Base systems only.
Hubba Hubba tent parts (rainfly or pole set) are model-specific: LT or HD. Ordering the wrong version will cause fit issues, so double-check your tent's model and size before purchasing.
Decision rules
- Stove pump not building pressure?: Order the Fuel Pump Plunger Assembly (product ID 492113). It's a straightforward swap for MSR liquid fuel pumps and costs only a few dollars.
- Dirty water tube leaking at the elbow?: Replace the GravityWorks/AutoFlow 90 Degree Elbow (product ID 492171). Confirm your system uses a CPC fitting before ordering.
- Tent rainfly or pole damaged?: Check your tent model (Hubba Hubba LT or HD) and size (1P, 2P, 3P), then order the matching rainfly or pole set (product ID 492124). Genuine parts ensure proper fit and weather protection. Always verify your tent's exact model and size before ordering tent parts.
Product facts
- Fuel Pump Plunger Assembly: Replacement plunger assembly for liquid fuel pumps, compatible with MSR brand equipment. If your stove pump feels stiff or won't pressurize, swapping this part restores function without replacing the entire pump.
Fuel Pump Plunger Assembly - GravityWorks™ / AutoFlow™ 90 Degree Elbow: Replacement right-angle CPC fitting for Platypus GravityWorks, MSR AutoFlow and MSR Trail Base dirty water tube connection. A cracked elbow can cause leaks that contaminate your clean water; this inexpensive part solves the problem fast.
GravityWorks™ / AutoFlow™ 90 Degree Elbow
Who this guide is for
Best for
- Backpackers maintaining MSR liquid fuel stoves who need a low-cost plunger replacement
- Campers fixing a cracked elbow on GravityWorks or AutoFlow dirty water lines
- Hikers replacing a worn rainfly or pole set on a Hubba Hubba tent
Not for
- Users of canister stoves or non-MSR liquid fuel pumps (plunger won't fit)
- Gravity filter systems with a different quick-connect standard (elbow incompatible)
- Tents other than Hubba Hubba LT or HD models (parts are model-specific)
