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Customer questions regarding Fuel Polishers

- Friday, October 15, 2010
Here are some good questions we have received lately from customers regarding our Fuel Polishers. All of these answers (and many others) are located in our FAQ section.

How can we know that diesel is flowing from inlet to outlet? Is there a minimum reading on the vacuum gauge to indicate that?

You cannot tell from the vacuum gauge if fuel is flowing. The pumps are capable of creating a vacuum in the filters when fuel is NOT present. One method for determining if flow is present is to check the discharge hose. When you first start the unit, you listen to the pump. Depending upon the length of your inlet hose, and the height of the suction lift, it will take from 30 seconds up to a minute to take suction. As liquid reaches the pump you will hear a change in pitch and volume from the pump. At the same time you will see the black needle on the vacuum gauge move to the left. How far this moves is a function of the length and diameter of the hose, as well as the height of the suction lift. The lower the number the better, as the gauge reads the total system vacuum, and not the condition of the filter.  The best method for determining flow, and measuring it, is to install our optional flow meter to the outlet of the system.


How do I prime the fuel system?

If the pump does not take prime in the first minute, or this is the first time the unit has been run, it may be necessary to prime the system. There are several ways in which to do this. Perhaps the easiest way to do this is to attach a very short hose to the inlet of the system, and place the hose into a container of diesel fuel, start the system, and allow the pump to run until the 2-3 gallons of fuel have been moved thru the system. If this is not possible, remove the lid of the filter, remove the filter element and spring cage. Instructions for removing the lid, and filter element are contained in your operating manual. Manually fill the filter housing with clean diesel fuel. Replace the filter element, and spring cage. Re-install the lid and tighten lid screws to proper torque. Proper torque specifications are located in your operating manual. It is suggested to install a foot valve, check valve, or non-return valve to ensure that system maintains its prime after initial prime.


Is there Dry Run protection for the pump?

The pump is not equipped with "Dry Run" protection. The operator must pay attention to the machine.   Normally, our systems are used to circulate fuel in a tank - pull fuel from the tank, and return it to the same tank. In this scenario, it would be very unlikely that the pump would ever run dry.  If your application is different, (such as pulling fuel from multiple tanks or using the system as a clean fuel dispenser), then running the tank / pump dry is more likely.

What is the high-pressure alarm?

The high-pressure alarm is used in situations where the discharge line can be closed with either a valve or hose kink.  This will protect the system and prevent hoses bursting which could leak fuel.  The high-pressure alarm is used on units equipped with a gear pump. This protects the pump from damage due to high pressure caused by closing the discharge or accidentally blocking the hose. It prevents excess current in the motor. Units equipped with the vane pump do not have this safety as the vane pump is equipped with a built in pressure bypass.
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