The FueLab 51503 is a billet-aluminium 515 Series carburettor fuel pressure regulator with two -AN10 inlet ports and a -AN6 return, adjustable from 4-12 PSI (0.28-0.83 Bar).
Overview
This is the carburetted counterpart to the EFI-focused FueLab 51501, sharing the same -10AN/-6AN housing but tuned to the much lower pressure a carburettor needs. It's part of Fuelab's 515 Standard Series, which spans everything from 1 PSI carburetted setups up to 125 PSI EFI systems.
Specifications
- Application: CARB
- Minimum Pressure: 4 PSI / 0.28 Bar
- Maximum Pressure: 12 PSI / 0.83 Bar
- Inlet Port Size: 2 x AN10
- Return Port Size: AN6
- Gauge Port Size: 1/8" NPT
- Construction: Billet aluminium, anodised to MIL-A-8625 Type II
- Fuel Compatibility: Petrol, diesel, methanol, and ethanol
- Warranty: Limited lifetime warranty
Key Features
- High flow capacity for demanding carburetted applications
- Two -10AN inlet ports and one -6AN return port
- Fine thread pitch for precise pressure adjustment
- Includes mounting bracket and stainless steel hardware
- 1/8" NPT gauge port with plug for an external pressure gauge
- 1/8" NPT pressure reference port with barbed fitting
How It Compares
Need an even lower carburettor pressure range? The FueLab 51505 adjusts from just 1-3 PSI in the same -10AN housing. Running EFI instead of a carburettor? Use the FueLab 51501 (25-90 PSI) in the same body.
FAQ
Is the 51503 suitable for an EFI fuel system?
No - at 4-12 PSI this regulator is built for carburetted engines. For EFI, use the FueLab 51501 (25-90 PSI) in the same -10AN/-6AN housing.
What's the difference between the 51503 and the 51505?
Both are CARB regulators in the same housing, but the 51503 covers a 4-12 PSI range while the 51505 is tuned lower, for 1-3 PSI applications.
