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Ford CVPI: Fuel Pump Failures
Most Ford CVPI fuel pump issues are NOT the fuel pump. This statement is based on a forensic analysis of warranty-returned, or customer-returned, police fuel pumps. Instead, the problem is almost always contaminated fuel.
As gasoline gets hot, the contaminants suspended in the liquid gasoline settle out (or precipitate out) into solids or sludges. These, in turn, plug or restrict the in-tank fuel filter, which starves the fuel pump. A starved fuel pump can cause engine stumbles or in some cases make the engine run lean enough to burn exhaust valves.
Ford has made numerous fuel pump changes over the past five years, such as larger fuel pump orifices (inlets) and changes in electric motor rotor winding material. So, to begin with, when you replace the pump in the CVPI be sure to get the very latest version of the pump. You may have to double-check on this. Something sitting on the shelf for a couple years, i.e., existing inventory, may not be the latest revision.
Since the real problem is contaminated fuel, the only real solution is to do something about the fuel. First, if you buy fuel in bulk, write into the contract that random testing of the fuel is required. This is to be done at the fuel provider’s expense and performed by an independent lab. You don’t need to know what the applicable standards for the fuel are, how much contamination, and what kind of contamination meets the standards. The lab will know.
All CVPI units, whether they use pump gas or bulk gas, can minimize the problem of contaminated fuel by one simple step. Keep the gas tank at least 1/4 full. This much gasoline, a 1/4 tank, keeps the fuel pump surrounded by gasoline, which helps keep the fuel pump cool.
Running the tank less than 1/4 tank depletes this “coolant” and allows the fuel pump to run hotter. It is this heat from the pump, in addition to the ambient heat, that literally distills the gasoline in the tank. This precipitates out the solids and the sludges, which plugs the fuel pump filter. Having at least 1/4 tank of gas in the tank reduces all of these risks.
Published in Police Fleet Manager, Jul/Aug 2010
Rating : 6.8
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