Many times, the pump will work fine at idle and low fuel demand RPMs/loads, but not be able to keep up at higher RPMs/loads when the engine demands the most fuel. When fuel starts to squirt out of the loose fitting, you can tighten it up. You will hear the pump run fast for about 10 seconds, then it will make a lower pitch as the fuel gets up inside the pump.
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If you are turning on your pump and the fuel lines do not have fuel in them, you will need to crack the fitting loose on the outlet side of the pump. Shut off valve not turned on or one that vibrated off The pick up inside the tank is suctioned to the side of the bladder, or it is clogged Turning on the pump without first priming or bleeding the air out of the fuel systemĬlogged inlet of pump (the Walbro pumps have a screen on the inlet that can cause severe restriction) Key items that cause cavitation may include: When the pump can't pull the fuel in, it creates a vacuum forming gas bubbles, when these gas bubbles collapse it creates a shock wave that destroys the bearings and veins. This is is the formation of gas bubbles in the fuel where the pressure of the liquid falls below its vapor pressure point.
The number one reason why a pump fails is because of Cavitation. On all the inline pumps, the fuel flows directly through the electric motor and bearings. None of the pumps are rated to pump methanol. The Hyper Racing technicians and teams have tried many different brands and styles of pumps. There are many stories out there that state "a friend told me they ran the same line for 3 years and didn't have any problems." Those experiences are more the exception than the norm.Ī common failure on the fuel delivery system is the pump. The line will eventually break down (gradually and without warning) and cause major problems ranging from clogging fuel filters to causing stuck nozzles. It may last longer, but it is at high risk. This line needs to be replaced every year. They are all essentially the same thing, and they are not compatible with methanol. The fuel line generally used on micro sprints is the blue or black rubber hose manufactured by Earl's, Aeroquip, or a few other manufacturers, its called Super Stock fuel line. These hoses are premade in length to fit the Hyper Chassis. We also can recomend our premade BMRS Lightweight Fuel Line. The HBS Fuel line is compatible with methanol. When it comes to buying fuel line, Hyper Racing recommends the HBS Line and Fittings. The system can be divided up into five main areas: View both pages to see all relevant information.įuel Delivery Systems are a very important part of the engine's performance and your ability to finish races. There are two pages in each of these documents.
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To view the diagrams of different fuel delivery systems, click on the links below, and a pdf file will open in a new window. The Hyper Racing Technicians highly recommend the installation of a flow-through type fuel delivery system with our fuel injection systems.