FRB Variable Frequency Reciprocating Fuel Pump
FRB Variable Frequency Reciprocating Fuel Pump

FRB Variable Rate Pressure Limited Reciprocating Fuel Pumps - with Integral Filter

6-8 psi and 8-11 psi Models • Up to 43 GPH • Not Degraded by Modern Fuel Blends • Designed For Marine Applications
By: Walbro

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The FRB is an advanced electric fuel pump with internal circuitry allowing it to operate at a variable frequency.
When turned on, it will cycle as long as there is a demand for fuel, but when fuel demand decreases, the pump slows down as it builds pressure in the fuel delivery line - until the pump's rated maximum pressure is reached, and the pump stops.

These FRB pumps are especially suitable for applications where battery life, low noise, and best durability are important.
Not recommended for applications such as heater or stove systems as output pressures are too high.
For heater and stove fuel pumps, use the lower pressure Walbro FRD Series. See Related Products, below.

The FRB is designed to serve as a primary pump (replacing a mechanical fuel pump) or as an auxilliary fuel pump (assisting the existing pump) for internal combustion engines.
A common application is supplying fuel to the those diesel refrigeration units mounted high on tractor-trailer trucks.

These pumps incorporate a new piston mechanism which, unlike rubber diaphragms, is not affected by modern, high-tech fuel blends.

• Pump cycles only when fuel is demanded
• The non-adjustable maximum output pressure is factory pre-set in the ranges specified in the table, below
• Continuous duty life (diesel fuel): >18,000 hours
• Flow rates as high as 60 gph, but 30 gph is a more typical maximum
• Compatible with all commercially available pump grade gasoline, gasoline-alcohol blends, diesel, and bio-diesel fuels
• Self-priming to 4 feet
• Current draw averages less than 2 amps
• USCG 16623-1 and 16623-2 approved; ignition protected
• Anodized, corrosion protection coating passes 1,000 hr salt spray test - suitable for marine applications
• Replaceable internal 70 micron mesh filter
• Magnetic trap for ferrous contaminants
• Inlet (lower, side)/Outlet (top): 1/4-18 NPSF (Dryseal American National Standard Straight Pipe Thread) — will accept NPT tapered fittings without leaking, thread sealant recommended
• Dimensions: 5.83"H x 2.76"Dia.
• Note - a suffix number (typically -1 or -2) in part number refers to type of packaging
• Made in USA

NOTE — Although the included instructions indicate that FRB pumps are supplied with hose clamps, at this time (5/8/13), these pumps do not include any installation fittings.

Heavy on the technical side...

Selecting among the Walbro FR Series electric fuel pumps:
All the FR electric pumps provide fuel until the fuel demand decreases, or flow is restricted - but they have different mechanisms for doing so.
FR pumps will cycle (pump) until they build up the pressure (head) in the outflow line - with an accompanying decrease in fuel flow - and reach their factory preset maximum pressure.
At this point, constant frequency pumps like the FRA will continue cycling - but no fuel will flow.
Variable frequency pumps, like the FRB and FRD, will slow and eventually stop cycling as the pressure builds.
If the pressure on the outflow side of the pump drops, both types of pump will start supplying fuel again.

• Choosing an FR Series pump is often less dependent on the application, and more a matter of user preference:
— FRA pumps are lower cost, basic models.
They have no built-in filter, and their constant cycling means electric current draw is constant - regardless of output, they are always making noise, they typically have a shorter lifespan (higher wear), and they can wear unevenly as the stroke can be shortened when operating near their maximal pressure.
— FRB and FRD pumps have a more expensive variable frequency circuit board, always use their full stroke length - so wear is evenly distributed, do not always operate at full capacity/maximal cycling — so less wear, longer life, less noise, and lower average current draw.
Additionally, the FRB models include a built-in/replaceable 70 micron mesh filter, so the user doesn't need to supply a pre-filter.

What the FR fuel pump is designed to do:
— In carbureted applications - The FRA and FRB fuel pumps self-regulate to their maximum output pressure when the carburetor bowl is full, and respond to float movement in the carburetor as required.
When the engine demands more fuel, the pump increases its flow rate.
When the engine demand drops, the pump reduces its flow rate.
— In diesel applications - The FRA and FRB pumps will deliver fuel to the diesel injector pump, assuring a positive pressure at the injector pump inlet.
These pumps are designed to refill diesel filters after service or replacement.
— In transfer applications, including fuel polishing, FRA and FRB pumps run continuously, as long as electrical power is supplied to the pump, and output back pressure is low.
— In diesel heater and stove applications, the task-specific FRD pumps will slow their cycling rate to deliver only the fuel required by the stove fuel metering valve ("carburetor").
FRD pumps can also fill day tanks in gravity feed installations.

Complete list of approved fuels for FR pumps:
— Unleaded regular gasoline, premium gasoline, gasoline-alcohol blends, diesel fuel, bio-diesel, Stoddard solvent, E85.

The versatile FR pumps are capable of pumping fluids other than fuels - including water and oils, thus having potential uses in many diverse applications. Please consult with us first, however, if you have a non-listed application in mind for one of these pumps, as there may be technical issues to resolve.

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