Well, I see a LOT of people talk about sucking oil through a filter vs pushing through. Here's the difference............... NOTHING.............. Pulling oil with vacuum is doing absolutely nothing over pushing it through a filter. WHY?? Because using vacuum IS pushing oil through a filter, you are simply using atmospheric pressure to "push" it through a filter. Pressure difference? Using a complete vacuum you can achieve a negative pressure so to speak, of more or less 15 PSI. You can Push oil through a filter at 15 PSI and get the exact same results a lot easier. With that said, if you purchase a bulk fuel dispensing filter, or any fuel filter to speak of, there is little to no chance of bypassing the filter, because they do not have a bypass. Inside an engine, dirty oil is a million times better than NO oil, so manufacturers use bypass valves in oil filters in case of a filter blockage. Inside a fuel system, NO fuel is a million times better than dirty fuel, so fuel filters won't be found to speak, with a built in bypass. With that said you WILL find that with higher pressures you will get dirtier oil to some degree.
All filters have a nominal and an absolute rating. When higher pressures are used, you will blow particles through in the nominal range, and you will bust the filter casing if the media becomes blinded. The filters I use are 12 mic absolute, 10 mic nominal and bust pressure of 285PSI. My pump is very capable of busting them. On my current setup I have a bypass valve that dumps back into the tank at 90 PSI, thats what I use to run the fuges hence the 90 PSI setting. Once the filters have reached a lack of flow at 90 PSI I change them. Well, thats the plan anyhow, none of them have ever made it past 60PSI more or less. Since I added the second fuge that allowed more processing in the same amount of time I have not seen pressures higher than 40 psi to get a reasonable flow into my truck tank.
If you need a good pump, visit a vehicle salvage yard and purchase a power steering pump off of an older asian car or truck. almost all Nissans of even the early 2000's had v belt drive steering pumps with a remote reservoir.
