The Old Switcheroo
94-97 OBS Ford Powerstroke owners have the added potential complication of a fuel tank selector valve in the suction side of their fuel system.
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Universal Pump Harness Diagnostics
This article will cover the complete operation of our Universal Fuel Pump Harness so that even those with limited automotive electrical understanding can locate and fix a problem if needed.
OBS HARNESS DIAGNOSTICS
This article will cover the complete operation of our OBS Fuel Pump Harness so that even those with limited automotive electrical understanding can locate and fix a problem if needed.
Contents Under Pressure
Remember that pressure is a function of flow and restriction, and that if you have enough flow from your pump and a properly working regulator to create the restriction, you will be able to set the pressure where you need it.
Leak Repair…
By now, if you have a “Low Fuel Pressure” problem, you should have identified it. As we move into the pressure side of the fuel system, know that if you are still looking for the source of a “low pressure” problem, the only possibility remaining is a massive fuel leak. If you don’t have an…
Pinch An Inch
If you are diagnosing fuel pressure issues that appear at idle, using the liquid-filled gauge in the regulator may be enough. If your issues appear or get worse under load, it is best to have some kind of fuel pressure gauge that you can see while driving the truck. This can be done with a temporarily installed “mechanics gauge with a hose”, with an aftermarket in-cab electric gauge or with a pressure sensor connected to a monitor screen like an Edge CTS. If you can’t see fuel pressure under load, you are going to have a hard time diagnosing the problem and confirming that it has been fixed.
The “Ever Since” Coincidence
It’s funny how phone calls from customers can remind me of other topics I have thought about writing an article on, but never got around to. Don’t worry, this one is pretty short.
Electron Flow = Fuel Flow
Probably the most common statement from truck owners that are experiencing some kind of issue with their fuel system is “I think the regulator is bad” or “I need to buy a new regulator”.