Diesel Filter Housings and Sedimenter Bowls: Maintenance and Replacement

13 November 2026 · Filters

The housing is the part everyone forgets. Elements get changed on schedule; the housing only gets attention when it leaks, cracks or strips a thread. By then the vehicle is usually off the road.

What fails in a housing

Failure	Cause	Symptom
Leak at the bowl thread	Overtightening, hardened seal	Diesel film on the housing
Cracked bowl	Impact, incorrect tightening, cold weather	Visible crack, fuel smell
Air ingress	Worn seal, loose drain plug	Hard starting, rough idle
Blocked heater port	Contaminated fuel, no draining	Waxing in cold weather

Bowl and sensor checks

Inspect the bowl for cracks around the thread and the drain boss.
Check the water sensor connector for corrosion; a false reading is often a contact problem, not a sensor failure.
Replace the seal whenever the bowl is removed.
Confirm the bowl diameter and thread before ordering a replacement — bowls of the same look differ in thread pitch.

When to replace the housing

Replace the housing when the thread is damaged, the mounting flange is cracked, the primer pump no longer holds pressure, or the heater port is blocked beyond cleaning. A housing that has been overtightened repeatedly will not seal reliably even with a new bowl.

Products in this catalogue

Part number	Item	OEM / reference
LH-4001	Diesel filter housing	6240031110
LH-4002	Diesel filter housing	not listed
LH-4004	Diesel filter housing	0706
LH-4005	Diesel filter housing	not listed
LH-4006	Diesel filter housing	94420201

Ordering checklist

Part number from the old housing or bowl.
Thread and diameter, measured if the number is unreadable.
Port layout: inlet, outlet, drain, heater.
Sensor type if the bowl carries one.

Diesel filter housings · Sedimenter bowls · Request a quote

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