Fuel Pump Pre-Filter: -6AN vs -8AN 100 Micron Screens
By DeatschWerks | Published: 2026-10-18
Category: Comparisons
Compare DeatschWerks -6AN and -8AN 100 micron fuel pump pre-filters. Learn which inline filter fits your fuel line and protects your pump.
Quick answer
For most street and moderate performance builds, the -6AN 100 micron pre-filter is the practical choice. If your fuel system already uses -8AN lines or you're planning a high-flow upgrade, the -8AN version matches that plumbing and keeps the same debris protection.
Why line size matters for your pre-filter
The -6AN and -8AN refer to the fitting size on the filter, which must match your fuel line. A -6AN filter fits -6AN hose and is common on stock or mildly upgraded systems. The -8AN filter is for -8AN line, often used on higher horsepower setups that need more fuel flow.
Both filters use 100 micron stainless steel mesh, so the filtration level is identical. Your decision is driven by your existing fuel line size and future plans, not by a difference in filtering ability.
Trade-off: flow capacity vs. fitment
The -8AN filter allows more flow due to its larger fittings, which is beneficial for high-flow pumps and larger lines. However, it won't connect to a -6AN line without adapters, adding cost and potential leak points.
The -6AN filter is easier to install on stock or -6AN systems and is lighter and more compact. But if you later upgrade to -8AN lines, you'll need to replace the filter as well.
Decision guide: -6AN vs -8AN
- Check your current fuel line size: Measure the inside diameter of your fuel line or look for -6AN or -8AN markings. Match the filter fitting to that size. If you're unsure, use a caliper or consult your fuel system spec sheet.
- Estimate your fuel flow needs: For engines under roughly 600 hp with -6AN lines, the -6AN filter is sufficient. For higher horsepower targets or existing -8AN lines, choose the -8AN filter. Plan for future upgrades now to avoid replacing the filter later.
- Consider adapter use: If you must use an adapter to fit a -8AN filter on a -6AN line, you add potential leak points and cost. A direct -6AN filter is simpler and more reliable. When in doubt, stick with the filter that matches your line without adapters.
Product facts
- -8AN, 100 micron, Fuel pump pre-filter: The DeatschWerks -8AN 100 micron fuel pump pre-filter uses -8AN fittings and stainless steel construction for durability. This filter matches -8AN fuel lines, making it the right choice for high-flow systems that need unrestricted delivery.
-8AN, 100 micron, Fuel pump pre-filter - -6AN, 100 micron, Fuel pump pre-filter: The DeatschWerks -6AN 100 micron fuel pump pre-filter features -6AN inlet and outlet for secure connections in performance applications. It fits standard -6AN lines, making it a drop-in upgrade for many street and track cars without changing plumbing.
-6AN, 100 micron, Fuel pump pre-filter
Who should choose which
Best for
- Street and track cars with -6AN fuel lines that want a direct, reliable pre-filter
- Builds with stock or mildly upgraded fuel systems where -6AN is the standard
Not for
- High-horsepower builds with -8AN lines that need the larger fitting to avoid flow restriction
- Anyone planning to upgrade to -8AN lines soon and wanting to avoid a second purchase
