How to Install a Carburetor Fuel Log with PTFE Lines
By DeatschWerks | Published: 2026-10-19
Category: How-to Guides
Learn step-by-step how to install a carburetor fuel log using PTFE fuel line kits for 4150 or 4160 style carburetors, including gauge connection tips.
Quick answer
To install a carburetor fuel log with PTFE lines, first identify your carburetor style (4150 or 4160), then mount the fuel log, connect the -6AN PTFE lines, attach the gauge, and perform a leak check.
PTFE vs. rubber fuel lines
PTFE (polytetrafluoroethylene) fuel lines resist heat and chemical breakdown better than standard rubber hoses, making them ideal for high-performance or high-temperature engine bays. However, PTFE is stiffer and requires careful routing to avoid kinking or stressing the fittings.
4150 vs. 4160 carburetor fuel log differences
4150 and 4160 style carburetors have different fuel inlet locations and port configurations. A fuel log kit designed for one style may not align properly on the other. Always verify compatibility before purchase.
Installation steps
- Step 1: Confirm carburetor style and kit compatibility: Check whether your carburetor is a 4150 or 4160 style. Match it to the corresponding DeatschWerks PTFE fuel line kit (with or without gauge). Common mistake: forcing a 4150 kit onto a 4160 carburetor can misalign ports and cause leaks.
- Step 2: Mount the fuel log to the carburetor: Secure the fuel log using the provided hardware. Ensure the log sits parallel to the carburetor body and that the inlet ports face the fuel line routing direction. Checkpoint: verify the log does not contact any moving parts (linkage, throttle arm) before tightening fully.
- Step 3: Connect the -6AN PTFE fuel lines: Attach the PTFE lines to the fuel log outlets and the carburetor inlets using the supplied AN fittings. Hand-tighten, then use a wrench for final snug—do not overtighten. Common mistake: overtightening AN fittings can deform the sealing cone and cause leaks.
- Step 4: Install the fuel pressure gauge (if applicable): Screw the gauge into the designated port on the fuel log. Use thread sealant sparingly on NPT threads. Position the gauge face for easy reading. Checkpoint: avoid blocking the gauge with other lines; you need visual access during tuning.
- Step 5: Perform a leak check: Turn on the fuel pump (engine off) and inspect all connections for drips. If using a gauge, confirm pressure holds steady. Tighten any leaking fittings slightly. Common mistake: skipping the leak check can lead to fuel spray or fire once the engine is running.
- Step 6: Final routing and securing: Route the PTFE lines away from exhaust manifolds, sharp edges, and moving parts. Use zip ties or clamps to secure the lines every 6–8 inches. Checkpoint: PTFE lines are stiffer than rubber—allow extra length at bends to prevent stress on fittings.
Product facts
- -6AN PTFE Fuel Line Kit for 4150 Style Carburetor w/ Gauge: DeatschWerks -6AN PTFE Fuel Line Kit for 4150 Style Carburetor w/ Gauge: dual fuel line kit, PTFE lines, black anodized fittings, includes gauge. The included gauge lets you monitor fuel pressure directly at the log, simplifying leak detection and system tuning.
-6AN PTFE Fuel Line Kit for 4150 Style Carburetor w/ Gauge 
-6AN PTFE Fuel Line Kit for 4150 Style Carburetor - -6AN PTFE Fuel Line Kit for 4160 Style Carburetor w/ Gauge: DeatschWerks -6AN PTFE Fuel Line Kit for 4160 Style Carburetor w/ Gauge: dual fuel line kit, PTFE construction, black anodized finish, includes gauge. If you have a 4160 carburetor, this kit ensures proper alignment and sealing without adapter modifications.
