Finally installed a fuel pressure gauge. It reads 25psi at idle and will move up to 35psi @70. Is this too high, and if so, what can I do to bring it down, but not change the pressure at idle? Thanks in advance.

 

Mine idles at 30psi and probably goes higher at speed. It pegs the gauge so I have no idea.
Im pretty sure the spec was something like 25ish at idle and 30-35 at 2k rpm no load.

 

If your fuel pressure is 25 psi @ idle it should drop @ 70 mph not increase. Mine idles @ 22 psi and will drop to 19 psi @ 75mph.
Unless I'm misunderstanding your question.

 

Could the fact that he has a 12v with a mechanical pump have something to do with it?

Still seems odd to me.

And no, 35psi is not to high on a 12v.

 

Your pressures are a little bit high for a 12 valve but are fine.
Problems arise when your pressure exceeds 45 psi.

 

Fuel Pressure: 18-24 psi at idle, 28-36 at 2000 rpm with no load.

 

I for one am jealous of you 12v guys and your fuel pressure. I didn't know so many of you monitored your fuel pressure, do the mechanical pumps fail often. I have been thinking of going to a new cam so I can run a mechanical pump. I'm on my 3rd one and it was acting funny the other day while towing.
CJ

 

The pumps don't fail often but the overflow valves do.
Monitoring your FP also prevents needless filter changes saving you time and money. Changing the filter based on mileage is redicuolous, one bad tank of fuel and the filter could be clogged in 10 miles. On the flip side I know a fellow who went 62k on the stock fuel filter that came with his new truck before it finally clogged.
With my FP gauge I don't usually see a drop in pressure that indicates it's time to change the filter until around 30k.