Fuel pressure

[Kennedy]

John,

Where is the best location to monitor fuel pressure on a 2006 DMax fuel rail or line going to pump?

I have a 2 micron pre filter back at the tank and was thinking of adding a fuel pump there also.

And what are the expected readings for both locations?

Sorry it's going to take me a bit to remember this forum is here.

I don't actively monitor fuel system restriction/pressure. Instead I have a gauge that I use as a tool to check periodically.




I won't get caught up in all the 2 micron over rating BS, but I will say that I do not care to have the best filter first in line and also don't care to have to do a quick filter change on the road as it means wearing diesel.

[Kennedy]

Quote from my site:

Restriction can be checked at idle speeds and at 2-3,000 RPM. Typically we will see approximately 2-3"hg at idle with very little variance as RPM increases. As a filter loads up, you will see restriction increase. When you hit about 5-6" hg (2" above baseline) I consider the filter well used and due for replacement. The early Dmax single layer media filters would run a long time without much of an increase in restriction. The latest dual media units seem to be doing a much better job of collecting dirt, but start at a higher restriction that rises quickly as they load up. Having this gauge on hand allows you to quickly and easily verify the condition and can be very beneficial when diagnosing fuel system related drivability issues. Typical OE filter life is < 15,000 miles. We have seen these filters load as early as 2500 miles or less depending on fuel quality.

[a5150nut]

Sorry it's going to take me a bit to remember this forum is here.

I don't actively monitor fuel system restriction/pressure. Instead I have a gauge that I use as a tool to check periodically.



I won't get caught up in all the 2 micron over rating BS, but I will say that I do not care to have the best filter first in line and also don't care to have to do a quick filter change on the road as it means wearing diesel.

That's alright John, change takes time.

And I agree primary should be a rock filter, secondary a little finer. But that is the way the truck came. I am considering one of your pumps between the tank and primary filter. 1/2 in line is already there just need the pump and two fittings and drill the bracket to mount the pump to it. I already have a Donaldson 4 mic to replace the stock filter.

I was just trying to find some sort of fuel pressure guage to monitor filter life. If nothing else a <1lb murphy switch and an idiot lite.

[Kennedy]

I prefer to shut the pump(s) down and go by restriction as it's more precise. Otherwise any gauge any place just keep the scale small.

The OE filter is 4 micron these days. Not sure about the WIX plastic garbage, but a true OE spec multi layer element would be.