PureFlow Raptor VP-100gph Universal Fuel Pump

The PureFlow Raptor 100 GPH universal pump, part number R1SBU369, is the bare Raptor-4G pump that AirDog builds into its Raptor lift pump systems, sold here without the truck-specific kit. It is the part people look for when a diesel's tired factory lift pump keeps losing prime, when an older Raptor head has worn out, or when a custom swap or tractor needs a self-regulating electric supply pump with no return line.

What this pump does

A lift pump feeds the injection pump. On common-rail and rotary-pump diesels the high-pressure pump depends on a steady positive supply; when supply pressure sags under load the result is hard starts, surging and, over time, a worn injection pump. The Raptor-4G uses a built-in adjustable regulator, which is why AirDog says no return line is needed. AirDog presets this universal 100 GPH version to 8 psi at the factory and states it can be adjusted up to 30 psi, so you set it to the supply pressure your injection system calls for. AirDog positions the 100 GPH Raptor as the choice for an owner who simply needs a replacement fuel pump, while the 150 GPH model is aimed at modified engines.

Signs you need a new lift pump

• Long crank times or loss of prime after the truck sits overnight
• Surging, stumbling or loss of power while towing or climbing
• Low or falling supply pressure on a fuel pressure gauge under load
• A lift pump that is noisy, runs hot or will not run at all
• Repeated injection pump damage traced to fuel starvation

Before you buy

Put a gauge on the supply side and watch it at idle and under load. If pressure drops only at wide-open throttle on a heavily modified engine, a 100 GPH pump may not be enough and the Raptor 150 GPH universal pump is the better fit. If pressure is low everywhere, check the filters, pickup and fuel lines for restriction or air leaks first, since a new pump cannot overcome a plugged filter.

Fitment and what is in the box

This is a universal, pump-only item. Per AirDog it is the 100 GPH Raptor-4G pump preset to 8 psi, adjustable to 30 psi, with a 9/16-18 ORB outlet fitting included. You need to supply a 3/4-16 fitting for the inlet side, plus your own relay, fused power, mounting and fuel line. It is not the complete vehicle kit; the complete Raptor kits add a relay harness, fittings, 1/2 inch fuel line, brackets and a manual. If you would rather have a bolt-in system with filtration and air separation for a 2004.5 to 2024 Ram, look at the AirDog FP-100-4G Cummins system. Not sure which suits your truck? Send the year, engine and current mods and we will help. Browse more supply parts in engine and performance.

Install notes

• Mount the pump low, close to the tank and below the fuel level where possible, so it pushes rather than pulls fuel over a long distance.
• Use a relay triggered by an ignition or key-on source with an inline fuse, not a direct switched feed.
• Filter the fuel before and after the pump. The AirDog water separator filter is one option for keeping water away from the injection system.
• Prime the system and check every fitting for leaks before starting the engine.
• Set pressure with a gauge at the injection pump inlet after the engine is warm, then recheck it under load.

What pressure is the R1SBU369 set to?

AirDog presets this 100 GPH universal Raptor to 8 psi at the factory and states it can be adjusted up to 30 psi using the pump's built-in regulator.

Does it come with a wiring harness and fittings?

No. It is the pump only, with a 9/16-18 ORB outlet fitting included. You supply a 3/4-16 inlet fitting, fuel line, mounting hardware, a relay and fused wiring.

Do I need a return line?

No. The Raptor-4G uses a built-in adjustable regulator, and AirDog markets the Raptor pumps as needing no return line.

Should I pick the 100 or 150 GPH Raptor?

AirDog suggests the 100 GPH pump for owners who want a replacement for a stock fuel pump and the 150 GPH pump for engines with injection pump or injector upgrades that need more flow at high RPM.

Does this pump filter or separate air from the fuel?

The universal Raptor is a lift pump only. Plan your own filtration before and after it, or choose a complete AirDog system that includes filters and air separation.