Disclosure: This post contains affiliate links. If you buy through them, we may earn a commission at no extra cost to you.
When I set out to review the EVIL ENERGY LS Swap Fuel System Kit, I didn’t install one myself. Instead, I dug through the product spec sheet and every buyer review I could find attached to the listing.
Here’s what the kit actually includes, what it costs, and what people who bought it are saying once it’s bolted in.
What’s In the Box
The full name on the listing is the EVIL ENERGY LS Swap Fuel System Kit: 6AN Adjustable Fuel Pressure Regulator with PTFE Fuel Line, 25 feet. It’s priced at $189.98, marked down from $223.98 at the time I checked.
- 6AN adjustable fuel pressure regulator with an aerospace-grade aluminum housing
- 25 feet of nylon-braided PTFE fuel line
- 6AN fittings and adapters sized for LS swap and EFI systems
- Choice of pressure adjustment range: 30 to 70 PSI, 20 to 120 PSI, or 30 to 140 PSI
On the spec sheet, the line itself carries a 5/16 inch inner diameter and handles up to 1,500 PSI working pressure, with a 4,500 PSI burst rating. EVIL ENERGY lists an operating range from negative 76°F up to 446°F, and rates it compatible with gasoline, diesel, and E85.
What Buyers Are Saying
At the time I checked, the listing showed 7 customer reviews, with 86 percent landing at five stars. That’s a small sample, so I’d treat it as a promising early signal rather than a verdict.
One buyer wrote that “after upgrading, the throttle feels more responsive, and the overall driving experience has improved,” which tracks with what an adjustable regulator should do on an LS swap running slightly lean or rich from the factory setting.
Shipping speed came up as a plus in the reviews too. That matches the broader brand pattern I found on Trustpilot, where fast delivery is one of the most repeated compliments.
Worth noting: on forums, some builders using EVIL ENERGY’s PTFE line elsewhere in the catalog reported it aging faster under heat than premium brands like Russell or Earl’s. That’s a material-level comment about the line family, not this specific kit, but it’s a fair thing to watch over the first year if your build runs hot.
Who Should Buy This Kit
This kit makes the most sense if you’re doing an LS swap or EFI conversion and need a regulator and fuel line in one order instead of sourcing each part separately. The three pressure-range options cover most naturally aspirated to mild forced-induction setups.
If you’re building for serious track use or running a big power adder, I’d read our EVIL ENERGY vs Earl’s Performance comparison before deciding, since the fuel line material question matters more as heat and pressure go up.
For everyone else building a daily-driven swap on a real budget, this kit hits the specs that matter at a price well under what a comparable Earl’s or Fragola bundle would run.
Not sure this is the right kit for your specific build? Our how to choose guide breaks it down by budget and use case.
Installation and Warranty Notes
Before you install, double check every AN fitting seats with your wrench set. Our research into brand-wide reviews found a few reports of fittings on certain kits running slightly off standard sizing, so it’s worth a five-minute check before you start cutting line to length.
For a full walkthrough on getting the line routed and clamped correctly, see our installation and maintenance guide.
This kit ships with EVIL ENERGY’s standard coverage: at least a 1-year warranty and a 180-day return window, with the first 90 days eligible for free return shipping if the kit is unused and still in its original packaging.
Buy it directly from EVIL ENERGY’s own site or its verified Amazon storefront only. Our authenticity guide explains why that matters for warranty claims.
Final Verdict
For the price, this kit packs in real specs: a genuinely adjustable regulator, PTFE line rated for E85, and enough length to route through most engine bays. The early reviews back that up.
It’s not a race-grade setup, and EVIL ENERGY doesn’t pretend it is. For a budget LS swap or EFI conversion, it’s one of the more complete single-order kits I found while researching this brand.
Want the bigger picture on this brand first? Read our full EVIL ENERGY brand review.
Keep reading: EVIL ENERGY Fuel Systems: Is This Budget Performance Brand Worth It?, How to Choose the Right EVIL ENERGY Fuel System Kit, and EVIL ENERGY vs Earl’s Performance.