Fuel pressure guage

[93DodgeCummins]

i am trying to figure out if i should get a Mechanical or Electrical Fuel pressure guage for my 1993 Dodge Cummins. can i get some help

[mprmn08]

mechanical is cheaper but your not supposed to put it inside the cab unless you have an isolator mounted on the outside firewall. elec. is nice but pricy

[Richie O]

I have a Isspro in my 93 with an isolator. I have a another gauge for the 89 and am pretty sure its going in with out an isolator. If it was a gas rig I would not do it, but for furnace fuel, I think its pretty safe. You sure want a turn off valve just incase it does leak. That way you can turn off the gauge and keep on going.

[RSWORDS]

I have a Isspro in my 93 with an isolator. I have a another gauge for the 89 and am pretty sure its going in with out an isolator. If it was a gas rig I would not do it, but for furnace fuel, I think its pretty safe. You sure want a turn off valve just incase it does leak. That way you can turn off the gauge and keep on going.

Mine is run w/o an isolator, no issues yet. I do like your idea about the valve. I'm gonna add one.

[PToombs]

I have a valve on mine with no isolator. The valve helps damp out needle vibration too, just close it almost shut. With it open I can't even see the needle it bounces so fast.
I did sleeve my line from the firewall to the guage. If I do get a leak, it will run back outside.

[GO OVRIT]

I run mine with no isolator and havn't had any problems. What gauge are you running Pete? I've got an isspro with copper tubing running to it and the needle never flinches. I figured if it ever started to leak I'd just pinch the copper line until I go t home to fix it.

[Richie O]

Mine does not flicker at all. I figured I would need to turn the snubber almost closed but it is fine wide open.

[PRINCETON_JAKE]

I just finished putting a fuel pressure gauge in my 92. I bought the tapped banjo bolt and washers from genos garage. I put it where the bleeder screw was (after the fuel filter). I bought a mr.gasket mechanical gauge (0-15psi) and used a autometer installation kit with a copper line (dont use plastic. I didnt use a isolator, or a needle valve, and i dont get any needle flutter. Every thing costed about $50 including tax and shipping on the bolt.

[PToombs]

I have an Optix white faced guage, 1/8th pipe needle valve from Graingers, and regular oil pressure plastic tubing. I sleeved it from the firewall to the guage with a 1/2" plastic tube, and slid it over the fittings on the guage. I have to keep the valve almost closed or the needle jumps pretty good. It could be due to the piston LP.

[Richie O]

It could be due to the piston LP.

I have 1 of those. still no jumpy.

[PRINCETON_JAKE]

I can here a noise coming from my gauge, it sounds like the pulse of the fuel pump. Its kind of anouing, but i can deal with it.

[DZL_Damon]

I can here a noise coming from my gauge, it sounds like the pulse of the fuel pump. Its kind of anouing, but i can deal with it.

I bet that is coming from your copper tubing. Especially if it's touching some metal or even plastic on it's route through the firewall and dash. I might use copper as well, but I will use a least a little rubber as an isolator and flex mount. Copper is known to crack once in awhile due to vibrational stress. I've replaced many air, steam tracing, and some diesel lines at work due to it.

A valve is always a good idea. I'm not worried about a little diesel drip in the cab, I'll just tighten it if that does happen. However, if something was to spring a bad leak, the isolation valve (closer to the pump than the gauge) will let you get home without making a bigger mess than you already did!

[ahale2772]

i have some winters gauges on my truck (picked them up for 5 bucks at my local parker store), and my needle goes crazy im trying to figure out some way of getting a steady reading i put a air bubble in the line but it flowed back into my regulator any ideas? i was thinking of a little piece of copper tubing with a steel plunger in it with fittings at both ends and maybe some orings, then i could make it an isolator as well, but i dont really care if it leaked it would brobably clean the truck if it did

[Ace]

You need a snubber.

[DZL_Damon]

Put a small valve before the gauge preferably closer to the pump. Close it all the way and then just crack it. That jumping in the gauge will cease, and now you have a saftey shut off valve if there was a problem.