Building a 500hp Fuel System: The Radium Engineering Parts You Actually Need
A 500hp build does not fail because the turbo is too small. It fails because the fuel system runs out of flow, drops pressure under load, or starves the pump mid-corner. Radium Engineering exists for exactly this problem - and if you are building a Japanese or Euro performance car in the UK, this is the shortlist of Radium Engineering parts that actually matter once you pass the 500hp mark.
Below is a ranked, build-ready spec list: what each part does, which platform it fits, and where it sits in the order of assembly. Everything here is genuine Radium Engineering hardware, stocked and shipped from the UK.
What a 500hp fuel system actually demands
Stock fuel systems are engineered for stock power. Push four or five times the factory output through them and three things break down:
- Flow. A single in-tank pump cannot move enough volume at the pressure a big-turbo build needs.
- Pressure stability. Pulsations from high-flow injectors and pumps cause inconsistent fuelling and lean spikes.
- Supply under load. In a saddle-style or shallow tank, fuel sloshes away from the pick-up during hard cornering, acceleration and braking.
A proper 500hp fuel system solves all three. Radium's range is designed as a system, not a pile of parts, so each component below covers one of those failure modes.
1. Radium Fuel Surge Tank - the foundation
If you buy one Radium part for a big-power build, make it a surge tank. The MPFST and MPFST-R keep a swirl pot full of fuel at all times, fed by a lift pump from the stock tank, with one to three high-flow pumps inside feeding the engine. The result is a constant fuel supply when you are pulling hard through a corner or launching off the line - the classic Radium surge tank use case that solves fuel starvation in a single step.
The MPFST-R goes further: it has a built-in regulator that returns low-pressure fuel straight back into the surge tank, which simplifies plumbing and keeps the whole system tidy. Fits Walbro GSS342, AEM 50-1200 and DW DW440 pumps.
2. Radium Fuel Cell - when you are done with the stock tank
For race use, fuel cells and competition builds, the Radium R10A Fuel Cell (10 gallon) is the upgrade that ends fuel-starvation arguments permanently. RA-series cells are designed and manufactured in-house to meet FiA and SFI safety requirements, so they belong in a car that sees scrutineering. Combined with a venturi jet pump kit, a fuel cell can feed a high-flow pump setup cleanly without the complexity of a modified stock tank.
3. Radium Fuel Pressure Regulator - pressure you can trust
Once you are moving serious volume, you need to hold fuel pressure steady at the rail. The Radium Engineering RA Fuel Surge Tank with Integrated FPR combines the canister and the regulator, or you can run a standalone Radium FPR. Either way, the goal is the same: consistent pressure across the rev range so the tune you paid for actually holds. Pair it with a Radium Fuel Pressure Gauge with 6AN Inline Adapter so you can see what is happening at the rail instead of guessing.
4. Radium Fuel Pulse Damper - the quiet fix
High-flow injectors and aggressive cams create pressure pulsations that show up as inconsistent fuelling and a rough idle. A Radium Fuel Pulse Damper smooths those pulsations, improving injector consistency and driveability on high-performance builds. It is a small part that fixes a frustrating, hard-to-diagnose problem.
5. Radium Fuel Filter - clean fuel, long injector life
Contamination kills injectors and pumps. A Radium fuel filter - or a hanger kit with an integrated microglass filter, like the EVO 7-9 Fuel Hanger Kit - keeps the system clean and gives you serviceable filtration without re-plumbing the whole car. The Mitsubishi EVO X Fuel Hanger does the same job for the tenth-generation car, supplied without pumps so you can run your choice of Walbro or AEM hardware.
6. AN fittings and lines - the plumbing that holds it together
A fuel system is only as good as its connections. Radium's AN fittings let you join the surge tank, cell, regulator and rail without leaks or adaptor stacks - for example the 6AN ORB Male to 8AN ORB Female adapter, or the 10AN Press Fit Exhaust Fitting for the Toyota 2JZ valve cover for crankcase and vent plumbing on 2JZ builds. Use genuine fittings with matching AN sizes and you avoid the slow leak that ruins a track day.
7. Catch cans and air-oil separators - keep the intake clean
Boosted engines push oil vapour back through the intake, where it coats the intercooler, dilutes the charge and contributes to detonation. Radium's catch cans and AOS handle that at the source:
- Radium AOS-R Kit, 2015+ Subaru WRX - air-oil separator with engine-coolant heating, delivering cleaner inlet air and less oil build-up.
- Radium Dual Catch Can Kit, Ford Fiesta ST - traps vapour from both PCV and crankcase circuits.
- Radium Catch Can Kit PCV, Ford Fiesta ST - the PCV-side solution for Fiesta builds.
- Radium Engineering Competition Catch Can XL - a one-quart minimum capacity unit for SCCA, NASA and Formula Drift requirements.
- Radium 10AN Exhaust Male Press Fit Toyota 2JZ Valve Cover - the vent-side building block for 2JZ catch can plumbing.
The build order that saves you money
If you are working through this list, do it in the order the fuel actually travels:
- Feed the surge tank or fuel cell.
- Set up filtration before the pump.
- Regulate pressure at the rail, and add a pulse damper.
- Plumb everything with genuine AN fittings.
- Separate oil vapour from the intake with a catch can or AOS.
Buying in that order means every part you fit is doing real work, and you are not re-buying fittings because the sizes changed halfway through.
Why buy Radium Engineering parts from a UK dealer
Radium Engineering hardware is not cheap, and the last thing you want is a grey-import part that does not fit or cannot be supported. Buying from an authorised UK dealer means genuine fitment, correct part numbers for your platform, and fast UK delivery - no waiting on international shipping, no customs surprises. Radium Engineering parts are designed to work as a system; buying them from a dealer who knows the range means you get the parts you need the first time.
Start your fuel system build
Whether you are plumbing a surge tank into a WRX, dropping a fuel cell into a dedicated race car, or just sorting catch cans on a Fiesta ST, the Radium Engineering range covers it. Match the part numbers to your platform, fit them in build order, and a 500hp fuel system stops being a weak point and starts being the most reliable part of the car.
Browse the full range and build your spec list - we stock the Radium Engineering fuel-system hardware UK builders ask for, ready to ship.
