Fuel Pressure Drop Across the new Nano filter?

[orhusky]

I did a search and didn't find anything on this. I have ISSPRO Gauges on the a post on my 12 truck. The fuel pressure runs from 11-12 psi at idle to around 6-7 psi under high fuel demand. Last fall I installed the extreme duty filter kit from Ram on the frame rail and a new Nano filter in the stock canister. I lost 1 psi right off the bat and after about 2k miles i was down 2 -4 psi across the board and under demand was down to 4 psi or so. I changed back to the stock 2010-20012 filter and all has been OK for the last 10k. I am getting ready to change both filters and want to use the new Nano filter for better filtration but wounder how low is to low for fuel pressure on these trucks through the new filter? Who else is monitoring their fuel pressure on the new Nano filter??

 

[Bob V]

Remember there is a low pressure pump built into the cp3 pump. GM and others do not use a external pump and just use it al a lift pump. As long as it is positive pressure you are supplying more fuel than the cp3 van use. In fact supply volume is more important than actual pressure. Pressure is simply opposition to flow. Think of you garden hose at home. You house water system might have 40 psi at the valve when it is closed, but the lawn isn't getting watered till the valve is opened. Depending on a lot of different things, the pressure will drop at the valve when it is opened. Pressure is not watering the lawn, volume is. Pressure really doesn't mean there is flow, it means there is a restriction.

 

[orhusky]

I guess I will re-set the warning light to come on at 2 psi and run with it. I had it at 5 psi and didn't like it flashing at me every time we powered up a hill with our fifth-wheel. I was expecting a drop across the new nano net filter but was surprised at how much.