Sourcing Guide
A practical way to compare OTX fuel filter seating TF 0001LZ to TF 0005LZ by PL420 reference clues, port threads, primer layout, mounting base and measurements.
A fuel filter seating, also called a fuel filter base or filter head, is more than a point where the service filter is attached. The assembly may include the filter mounting face, fuel inlet and outlet ports, a primer, mounting base and sealing features. Similar castings can have different connection layouts, so the correct approach is to compare the complete unit before ordering.
This guide covers the OTX fuel filter seating range TF 0001LZ to TF 0005LZ. The catalog contains PL420 and OE number clues, but these clues should be used with physical photos and measurements rather than as an automatic interchange decision.
The reference product has a hand-primer unit, a machined filter face, several threaded connections and a bolted mounting base. A replacement with the same filter thread may still be unsuitable if the inlet and outlet are on different sides, the primer is missing, or the mounting holes do not match the installed bracket.
Before removing the old component, take one wide installed photo. Then photograph the filter face, the primer, every port, the mounting plate and the readable casting or OE markings. This makes it easier to compare the fuel routing and orientation, not only the general shape.
Each code in this group carries PL420 and OE number clues in the catalog. The size and thread notation below is a useful starting point for a matching check; it must be verified on the actual item.
| Catalog Code | Reference and Size Clue | What to Confirm |
|---|---|---|
| TF 0001LZ | PL420; 612600081294 / 612630080088; catalog size notation 104 x 75 | Filter thread, two M18 x 1.5 port clues and primer layout. |
| TF 0002LZ | PL420; 612600081294 / 612630080088; catalog size notation 115 x 79 | Overall height, port direction and mounting footprint. |
| TF 0003LZ | PL420 reference clue; catalog size notation 104 x 73 | Port count, side-port position and sealing surfaces. |
| TF 0004LZ | PL420 reference clue; catalog size notation 104 x 73 | Primer configuration and mounting-hole pattern. |
| TF 0005LZ | PL420 reference clue; catalog size notation 105 x 76 | Height, filter face and thread details against the old unit. |
The catalog may show closely related dimensions, but a small difference can change clearance, hose routing or bracket fitment. Keep uncertain lines pending confirmation until the installed orientation and connection details have been checked.
Fuel filter seating can be reviewed together with fuel filters, replacement elements and other fuel filter bases and housings. For a mixed maintenance order, list the known part numbers and quantities separately from the lines that still need photo confirmation.
Send the OTX code when available, readable OE numbers, photos of the front, rear and port side, measured overall dimensions, thread information, truck or engine details when known and the required quantity. This gives the supplier enough information to compare the complete fuel filter seating rather than only a single reference number.
Send a fuel filter seating inquiry with the photos and purchase list. The item can then be checked against the catalog clues, primer arrangement, mounting pattern and connection layout before quotation.
Use this guide to organize a clearer quote request instead of choosing from a short product list.
Part number, truck brand, model, engine model, chassis number and old-part photos help confirm the correct replacement before quotation.
Filters, brake parts, clutch parts, chassis parts, cab parts, bearings, sensors and assemblies can be checked together for one practical order.
Share quantity, packing preference and whether the order is for fleet repair, workshop use or distributor stock.
Send part numbers, truck models, chassis numbers, old-part photos or sample photos. We can help check multiple items and combine them into a practical export order.