LS Engine Kit

Q: 58 PSI fixed or 20 to 120 PSI adjustable, which regulator do I actually need?

Pick by how your engine is controlled, not by price. Choose 58 PSI fixed if you are running a factory style LS ECU with the stock returnless calibration. 58 PSI is the OEM target, so the tune stays honest and your injector data does not need rescaling. This is the right call for a stock or bolt on 4.8, 5.3 or 6.0. Choose 20 to 120 PSI adjustable if you are on a standalone or aftermarket EFI, running E85, adding boost, or if you plan to change injectors later. Adjustability lets you raise base pressure to buy injector headroom instead of buying new injectors. Both kits ship with a 10 micron inline filter , which is what protects modern EFI injectors from tank rust after a swap.

Q: My 5.3 came out of a truck with AFM/DOD. Does this kit fix the lifter problem?

No, and that is worth being clear about. AFM/DOD lifter failure is an internal engine issue and is solved with a lifter and valley cover delete plus a non AFM camshaft and an ECU tune. Fuel system parts do not touch it. Plan that work while the engine is still on the stand, because pulling heads later costs a full weekend. Where a proper fuel system does help reliability: Clean, consistent pressure stops the lean surges that show up as detonation on a budget 5.3 build. 10 micron filtration keeps a twenty year old junkyard tank from feeding rust into your injectors. An oil catch can reduces the oil vapor and carbon buildup that fouls valves on a high mileage LS. Start at $32.99 in the Oil Catch Can Kits collection.

What a Complete LS Engine Kit Actually Needs Before It Fires

Most stalled LS builds do not stall on the block. They stall on the four feet of plumbing between the tank and the fuel rail. A junkyard 5.3 LS or 6.0 will run all day on stock internals, but the factory returnless system, the 3/8 quick disconnect lines and the OEM in tank pump were engineered for a 1500 pickup, not for a 3200 lb swap car pulling 6500 RPM. That is why an LS swap fuel kit is the first thing to buy and the last thing to cheap out on: a lean condition at wide open throttle destroys pistons faster than any lifter ever will.

The second thing builders underestimate is thread compatibility. Factory LS fuel rails use M12 x 1.5 and M18 x 1.5 ports, not AN. Buying a pump here, a regulator there and a length of hose somewhere else is how a Saturday install turns into three weeks of waiting on adapters. Every LS engine kit below ships with the correct 6AN hose ends, unions, Y block splitter and the M12/M18 adapters for factory LS ports, so the box you open is the whole job.

Match Your Fuel System to Your Power Target

Build	Power Target	Pump	Line Size	Pressure
Stock 4.8 / 5.3 swap, pump gas	Up to 400 HP	300 LPH inline	6AN (3/8")	58 PSI fixed
Cam and bolt on 5.3 / 6.0	400 to 600 HP	300 LPH inline	6AN (3/8")	20 to 120 PSI adjustable
E85 or boosted street car	400 to 550 HP on E85	405 LPH inline	6AN PTFE	20 to 120 PSI adjustable
Track car, fuel cell, race fuel	600 HP and up	405 LPH + surge tank	6AN antistatic PTFE	20 to 120 PSI adjustable

E85 needs roughly 30 percent more volume than gasoline for the same horsepower. If E85 is anywhere in your plan, buy the larger pump now.

Which LS Fuel Kit Should You Add to Cart Today

Three price tiers cover almost every swap. If you already have a working return line and only need pressure control and filtration, start with the regulator kit. If the car is stripped and you are plumbing from the tank forward, buy the complete kit and skip the parts chase. All three fit 1999 to 2014 Chevrolet and GMC 4.8L, 5.3L and 6.0L LS based engines and work with gasoline, E85 and diesel.

Hose material is the other decision. CPE is a flexible rubber core hose that routes easily in tight tunnels and costs the least, ideal for a daily driven muscle car. PTFE has a chemically inert core rated 1500 PSI working and 4500 PSI burst, from 76 below zero to 446 degrees F, with zero permeation, so it will not weep fuel smell into the cabin on an E85 car. Antistatic PTFE adds a conductive inner layer that bleeds off static, which is what tech inspectors look for on a race build. Note that PTFE is stiff and will not fold in half, so plan your bend radius before you cut.

Build My Fuel System

Rounding out the build: an oil catch can kit from $32.99 keeps PCV oil vapor out of your intake valves, a fuel pump kit covers surge tank and in tank options, and stacked plate oil coolers from $69.99 protect a swap that runs hot in a tight engine bay.

Orders ship from Diamond Bar, California, and every kit carries a 1 year warranty and a 90 day return window.

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FAQs about LS Engine Kit

Will this LS swap fuel kit connect to my factory LS fuel rails, or do I need extra adapters?

It connects directly. Factory Gen III and Gen IV LS rails use M12 x 1.5 and M18 x 1.5 ports, and both adapter fittings are included in the CPE/PTFE LS Swap Fuel Kit along with 6AN straight and 90 degree hose ends, a 6AN union and a Y block splitter. You do not need to source anything from a second vendor to reach the rail.

Two things to confirm before you order:

Your tank side connection. If you kept a factory tank with quick disconnect nipples, add a quick disconnect to AN fitting. If you are running a fuel cell, the bulkhead is usually already AN or ORB.

Your rail orientation. Truck rails and car rails place the feed on opposite ends, which changes whether you want the straight or the 90 degree end at the rail.

58 PSI fixed or 20 to 120 PSI adjustable, which regulator do I actually need?

Pick by how your engine is controlled, not by price.

Choose 58 PSI fixed if you are running a factory style LS ECU with the stock returnless calibration. 58 PSI is the OEM target, so the tune stays honest and your injector data does not need rescaling. This is the right call for a stock or bolt on 4.8, 5.3 or 6.0.

Choose 20 to 120 PSI adjustable if you are on a standalone or aftermarket EFI, running E85, adding boost, or if you plan to change injectors later. Adjustability lets you raise base pressure to buy injector headroom instead of buying new injectors.

Both kits ship with a 10 micron inline filter, which is what protects modern EFI injectors from tank rust after a swap.

Is this safe for E85 long term, and does the hose material matter?

Yes, all three hose materials in these kits are ethanol compatible, but they age differently.

CPE is a chemically resistant rubber core hose. It is the budget friendly choice and fine for a daily driven pump gas or E85 car, and it bends easily for tight chassis routing.

PTFE has an inert fluoropolymer core with zero permeation, rated 1500 PSI working, 4500 PSI burst, and 76 below zero to 446 degrees F. If your car sits in a garage attached to your house, PTFE is the one that will not fill it with fuel odor.

Antistatic PTFE adds a conductive inner liner that dissipates static charge, which matters at higher flow rates and is often required at tech inspection.

One install note that prevents returns: PTFE hose is stiff and cannot be folded in half. Measure your bend radius, use the supplied 45 and 90 degree ends for corners, and cut the hose with a proper cutoff wheel rather than a hacksaw so the braid does not fray.

My 5.3 came out of a truck with AFM/DOD. Does this kit fix the lifter problem?

No, and that is worth being clear about. AFM/DOD lifter failure is an internal engine issue and is solved with a lifter and valley cover delete plus a non AFM camshaft and an ECU tune. Fuel system parts do not touch it. Plan that work while the engine is still on the stand, because pulling heads later costs a full weekend.

Where a proper fuel system does help reliability:

Clean, consistent pressure stops the lean surges that show up as detonation on a budget 5.3 build.
10 micron filtration keeps a twenty year old junkyard tank from feeding rust into your injectors.
An oil catch can reduces the oil vapor and carbon buildup that fouls valves on a high mileage LS. Start at $32.99 in the Oil Catch Can Kits collection.

What else do I need to finish the swap besides fuel?

Budget for four systems, not one. Builders who order fuel only usually place a second and third order within two weeks, which means extra shipping time and a car on jack stands.

Fuel delivery. Pump, adjustable or fixed regulator, 10 micron filter, 6AN line and fittings. Covered by the kits above from $118.99.
Crankcase management. Baffled oil catch can with a drain valve, 300ml for a street car or 750ml to 3L for a boosted or high RPM build.
Cooling. LS swaps push the engine forward in tight bays. An aluminum radiator, a 12 to 16 inch electric fan with a 175 to 185 degree thermostat relay at $55.99, and a stacked plate oil cooler from $69.99 handle summer traffic.
Air side. A 92mm throttle body for LS1, LS2, LS3, LS6, LS7 and LSX if you are opening up the intake.

Everything above lives in the same LS Engine Kit collection, so you can build one cart and take one shipment.

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LS Engine Kit

What a Complete LS Engine Kit Actually Needs Before It Fires

Match Your Fuel System to Your Power Target

Which LS Fuel Kit Should You Add to Cart Today

Build My Fuel System

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What a Complete LS Engine Kit Actually Needs Before It Fires

Match Your Fuel System to Your Power Target

Which LS Fuel Kit Should You Add to Cart Today

Build My Fuel System

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