Good fuel pressure through a good gauge.
What more can a guy ask for.

 

You are wrong though, the vp does the vibrations. This is what takes the regulator valve out of the lift pumps.

 

That's ok, but how do you monitor it at WOT under load?


phox

 

I think he's trying to show that one gauge is pre-filter and maxxed out. The other one is post-filter and reads a little lower. Just a guess.

 

I'm a dummy, so for us dummies how do you get the pictures in there.

 

Cool Instrumentation Eric!

 

Well, it still leaks on the fuel side of the isolator. Everything is tight but it appears to be leaking from the large screw used to bleed the fuel side of the system. I'm sick of dealing with it so the isolator is hitting the trash can once I source a new fuel hose and needle valve.

So if the VP44 isn't creating the fuel pressure pulses won't moving the fuel pressure pickup point closer to the LP (i.e., canister) make the pressure spikes seen by the gauge worse?

 

If its the 44 why is that when I removed the lp and installed the FASS with all that rubber line that my gauge issues stopped! That gauge is as solid as a rock since the FASS install. I am even running a larger line inside the cab to the gauge which would mean a larger volume of fuel pulsations.
The truck is running -6 from the FASS forward to stock fuel filter and then -8 Aeroquip lines to the 44. Fuel pressure is pulled off of a block on the 44 inlet.

Rick

 

You pretty much explained it. Larger lines and rubber. With the same lines mine vibrated as bad with the FASS as before, no difference. The same pulsation, larger lines to absorb more of it. How long has it been on? Give it a couple of months and the vibs start generally. As soon as the air works its way out that is absorbing the vibrations. I used to drain mine and blow it out to stop them.

 

So it the long and short of it is that one has to either:

1. Live with the isolator if they can get the air out, get it to work, and not leak.

2. Replace the entire fuel system so the gauge won't rattle. Didn't I buy the gauge to keep an eye on the stock fuel system to begin with?

3. Run fuel straight to the gauge and consider the fuel pressure gauge as a "routine maintenance item" just like the lift pump.

I guess the answer to my original question is NO, there is not a "good" way to run a fuel pressure gauge on a STOCK fuel system.

 

It's really not complicated or involved. Run a line from a point past the filter to the gage, put a restriction like a needle valve in the line. Hook it up and like thousands of other systems, it works fine and is trouble free. Until electronics came into it, all big trucks and equipment did it just this way, with fuel pressure oil pressure even water pressure on some. It's no big deal.

 

I had it setup originaly with a rubber line from the VP44 to a hardware store needle valve (barely open) and plastic tubing from the needle valve to the guage. Even with the rubber line and needle vavle I am on my sencond gauge in 15,000 miles and this one is rattling.

I'm going to try moving the fuel pressure pick-up point to the bottom of the fuel filter canister and I'm also going to order a quality needle valve. Hopefully that will keep the next fuel pressure gauge alive longer.

 

I have an Isspro gage and half of its life it rattled. Still going strong. But it is fairly new, only been on for about 200,000 miles.

The best needle valve is the NAPA deal, I don't have the number, but it is on one of the threads about the gages.

 

possibly try a pressure snubber through McMaster or the like instead of a needle valve. used one for my boost gauge and it worked great...never did try the fuel gauge (since i didnt need to) but i'd bet it would work. clean install as well. just throwing out another idea that i didnt see mentioned...

 

I'm one ahead of you. I ordered a snubber and valve from McMaster earlier.