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A HIGHLY ACCURATE DIGITAL GAS GAUGE No more guessing with inaccurate gas gauges. Utilizing digital electronics in the transducer the STANDARD HORIZON FF41 is able to provide fuel remaining on a digital display, for easy interpretation in a highly accurate manner. DISPLAYS FUEL FLOW IN G.P.H. OR L.P.H. See fuel usage in US Gallons, Imperial Gallons or Liters Per Hour. Monitor fuel consumption changes as throttle adjustments are made in various sea conditions. TOTAL OR TRIP FUEL BURNED The FF41 displays total consumption and trip consumption. Both calculations may be independently re-set at your convenience. LOW FUEL ALARM A user selectable alarm can notify you when a critical low fuel level has been reached. SIMPLE FLUSH MOUNT INSTALLATION AND SETUP Interrupt the existing gas fuel line, at convenient locations to install the in-line transducer with the included fasteners. Run the transducers electrical cable to the display. The FF41 display fits into the ordinary 2" engine gauge cut out. A nifty crown shaped mounting bracket snugs the instrument to the dash. From the keypad, the FF41 setup is a snap. Information is retained in the FF41?s non-volatile memory, even when power is interrupted. LIFETIME FLAT RATE SERVICE PROGRAM In addition to a one year parts and labor warranty, STANDARD HORIZON digital instruments are supported against defects in parts and workmanship, for as long as you own them. We call it our Life Time Flat Rate Service Program. As long as a STANDARD HORIZON instrument is maintained in reasonable condition by the original owner and shows no evidence of physical abuse, neglect or intentional damage, STANDARD HORIZON will repair it to original factory specifications for a fixed amount established on the date of purchase. The fixed amount is model dependant, so check with your authorized STANDARD HORIZON dealer or STANDARD HORIZON for details. EXTRA LARGE DISPLAY Visibility is not a problem, with enormous bold digits and informational flags on a high contrast background the FF41 is easy to see, even from a distance. BACKLIGHTING Visibility is further enhanced with backlit keys and LCD display. WATER AND IMPACT PROOF The molded, one piece waterproof front lens and keys of the FF41 make it perfect for open cockpit installations, where rain, spray and a drenching can be expected. Durable, coated PCB?s are securely fastened in a shock-tested chassis to withstand the pounding the FF41 will be subjected to on a foul day. COSMETIC MATCHING GAUGES Investigate the cosmetically matching DS41 Depth Sounder and SL41 Speed/Log/Temperature Instruments. These accurate instruments fit right into the dash along with the FF41 to match your other engine gauges.

Model
Fuel Transducer
HS50	15 Fuel Transducer Extension Cable

Marine \ Owners Manuals \ Instruments       FF41 Owners Manual  ( 91.64 KB )

Model	Description		List
064022016A	Round Chrome Bezel		N/A
160001020A	Mounting bracket		N/A
250002017A	Cable, power cord		N/A
568002012A	Round Black bezel		N/A
580010123A	Flush mount nuts		N/A

How much fuel will my engine use?

This is a very common question and it helps to know a bit about typical engines. A two stroke outboard motor is the heaviest user of fuel and the figures in examples we give will always be the worst possible case. The new four stroke and EFI technologies will give you significant reductions in fuel consumption. Worst Case Two Stroke Fuel Consumption Formula Divide the horsepower by 10. This gives you the number of US gallons per hour at full load. Convert US gallons per hour to liters by multiplying by 4. Example: A 100 horsepower engine will use 10 US gallons or 40 liters per hour flow at maximum revs. As a rough guide an inboard four-stroke engine will use about 60% of the typical outboard engine, for example, a 100 horsepower engine will use 6 US gallons or 24 liters per hour, once again at maximum revs, and this is a worst case situation. NB: These are typical values for a planing hull and a typical boat with almost any petrol outboard engine will be reaching a maximum speed of approximately 30 knots unless it has an exceptionally large engine for the size of the boat.

My fuel computer gives incorrect readings

1) Check that the fuel line is clean, i.e. that the transducer is not clogged up with dirt, and check that the turbine is spinning freely. This can be done by very gently blowing into the turbine and listening for a whirring sound. This must be done very carefully because the turbines are made to spin in petrol, which acts like a lubricant. If the turbine is spun too fast in air the bearings can be damaged, in which case the transducer will be ruined. 2) Each fuel computer must be calibrated as each fuel transducer will have slightly different characteristics and the factory settings are not going to be perfectly accurate in every case. We have found that by methodically going through the manual many calibration related problems are solved. There is a good section on calibration in the user manual. The best way to calibrate the fuel computer is to use a tote tank and use a known amount of fuel, and then calibrate the instrument to read the same amount. Alternatively the fuel computer can be calibrated by simply adjusting the flow rate displayed up/down, but this requires accurate knowledge of the flow rate, and calibrating in this manner is recommended for experienced technicians only.

My fuel computer gives erratic readings

1) This is usually due to dirt in the fuel line clogging the transducer or in the case of diesel installations, pulsing in the feed or return line or both. 'Pulsing' is caused by the pump in the diesel engine, and can be felt by squeezing the fuel line. The effect is similar to feeling ones pulse, a periodic tapping. This pulsing can cause the transducers to give erratic readings, and can also destroy the bearings inside the transducers, which will cause the display readings to be incorrect. Pulsing can occur on both the feed and the return lines, although it is usually more commonly found on the return line. To eliminate pulsing a fuel filter must be installed in between the transducer and the engine. This is usually an effective solution, as fuel filters should have a sufficient sized chamber to provide enough damping to eliminate any pulsing that may occur. Another cause of erratic readings is the way the newer EFI engines operate which is by delivering fuel to the engine from a fuel reservoir. This reservoir (or bowl) is refilled from the main fuel tank only when the bowl level is getting low. This produces a high flow rate through the fuel transducer when the bowl is filling and little or no flow rate when the bowl is not filling. This pulsating flow must be averaged by the FF41 instrument to give a stable and accurate flow reading. Depending on the 'pulsing period' of your engine the fuel transducer may be having difficulty in displaying a steady flow. Please contact STANDARD HORIZON for any further questions or advice.

Fuel readings initially correct but after a few minutes unit reads "0"

1) The FF41 have a thermistor in series to the output to the fuel transducer. If there is some fault in the wiring or the fuel transducer is faulty then the thermistor will trip and without power to the transducer it will give a reading of "0".