93-12Smoke

Looking at adding a fuel pressure gauge on a column pod. Would rather run a mechanical gauge but it seems they all say they need to be mounted outside the vehicle. I understand why this is necessary for gas applications but is it necessary for diesel applications?

On a side note I'm wanting to paint my pillar pod to match my burgundy/ dark red interior. Anyone know what color and code that trim is. The black pod on the red trim looks tacky

j_martin

To safely run a mechanical fuel pressure gauge, you need an isolator.
Mallory 29806, for instance.

93-12Smoke

What is the purpose of that little jewel?

Onemoparnut

I have an isspro isolator on mine. It is never a good idea to run any kind of fuel in the cab.

j_martin

It's just a diaphragm. Fuel on one side, glycol or something on the gauge side. Fuel can not then enter the living quarters. The pressure is equal on both sides.

In an accident when things are getting broken, it could be the difference between life and death.

We use them a lot in high performance boats.

deanhinsley1963

I have the Autometer mech. gauge 0-15 psi and a isolater as well.

sootnsmoke

I agree about not running fuel in cab to a gauge without an isolator. However, many have reported isolators can really effect gauge accuracy. I am on the fence still about going electric vs mech with an isolator.

93flatbed

I do. No isolator. Just a ball valve at the junction. I'm not really worried about my cab smelling like diesel if something were to let loose. Fire hazard is very low, so I take the risk. Been like that for 3ish years, still just fine. But as a side note my truck is usually sitting on jack stands since I hardly ever drive it. If it were a daily driver I'm sure I'd still do it that way.

j_martin

If there's an air bubble in the gauge line, it'll affect accuracy considerably. Otherwise there's little effect on the pressure. Properly installed, they are reliable and safe.

93, last time I checked, diesel fuel is flamable.

RonA

I run a mechanical gauge on mine plumbed into the cab. With the needle valve there is almost zero flow on the line. It is what it is.
For the price I would recommend you install a new piston pump and then check the pressure once a year with a $10 oil pressure gauge if you are concerned.

93-12Smoke

Well in looking to install it on my 4bt to monitor pressure with the large injectors I just installed.

Thunderhog

My Brother and I have restored a couple NASCAR cars from 1969 and 1971 and both had fuel pressure gauges in the cockpit and no isolaters. (That is how they did it back then!) That said, when a leak occours, it is either a drip, or a very fine spray. The drip is not that big of a deal, still burns, still dangerous, however, harder to get started. Now, the fine spray is a different animal, and can ignite, and burn easily and very hot and very fast.
I have witnessed this first hand, and it was frightening!
On both of those cars we chose to install everything as it was, however, niether was functional. (the lines were dummies)
I would not run fuel into the cab, ever! Just my 2 cents.

Dave F

where is the best place to put a fitting to install a p gauge?

bannerd

Defi makes a fuel pressure Guage that is digital. The sensor plumbs into anything pretty much. Good for 150psi.. expensive though.

j_martin

Replace the bleeder banjo bolt with one that has a 1/8" pipe hole in it. Geno's has em.