I just got done installing a Isspro mechanical fuel pressure gauge in my 03 using the tapped banjo bolt from Genos.

No isolator. I am not worried about having fuel piped to inside of cab.

Bump the starter and I get about 7psi
Idle about 5 psi
WOT about 1-2 psi

Does this sound right?



I will say that Isspro has much better gauge illumination the Di-pricol.

Di-pricol wanted $130 just for fuel pressure gauge.

Installed Isspro including the new cubby hole 3 gauge pod, lines and valve for $130

 

No those pressures are correct. The 3rd Gens run lower. My gauge numbers are about the same. I don't run quite as low at WOT. But my truck is stock. My understanding is that as long as your numbers are positive you're ok.

 

Try zero at WOT......
Greg

 

Thanks for the responses.
I feel better now.
I do field service repair for a company that makes medical & narcotic dispensing
cabinets.
Lots of traveling in the middle of the night to the middle of nowhere.
Once I get my tax refund I may buy a spare LP and keep under seat

Wish they would make a chip that improved mpg without costing
$400

I have enjoyed this board very much. A lot of information passed freely among freinds. Like one big coffee shop.

 

I get the same too. It seems like it gets lower with colder temps....

 

My understanding is that Isspro is coming out with a white faced fuel pressure gauge to match the 2005 Dodge in about a month. The guys at www.dieselmanor.com said they are considering making their own isolator to go with this gauge as the isolators are DiPricol and require extra fitting adaptors to make them work with the Isspro gauges.

Is it just me...I'm nervous about diesel in the cab. What is everybodys' feeling about isolators? Don't isolators also help to keep pressure pulses from ruining the gauge?

 

Isolators are fine but I have been reading that they fail alot. So far I am not getting any pulses and I cannot see diesel in the tubing to the gauge inside the cab.

This is how I got mine setup.
Geno's tapped banjo bolt on pump,
45 degree brass elbow,
brass hose barb,
2 1/2 ft of rubber fuel line,
hose barb,
1/8 npt fuel line vavle (1/4 turn) valve,
compression fitting for 1/8 solid white tube ( like used for boost) that runs to gauge.

Valve is running wide open and no pulses.
Before I tighten compression fitting I bumped starter to fill rubber fuel line to valve.

I figured that if the small white tubing could handle 35+ psi of boost pressure
it would handle 15 psi max fuel presssure.

Diesel fuel is mostly oil,
antifreeze ( used in some isolators) is caustic and stinks.

If it does leak I can always turn the vavle off.

Some guys found small needle valves to use instead of the fuel line valve I did.
Just cracking open the needle valve seemed to dampen the pulses.

 

I have 18psi at idle and 14psi at WOT....... Oh yea but I have the Air Dog. was running 6psi at idle and 0 at WOT with stock pump.