SB

iTrader: (1)

No liquid on engine. If it get's hot enough it will make the gauge read wrong...the liquid expands and presses against the diaphragm which makes the gauge read lower than actual fuel pressure.

Just saying after experience with a few hundred of them. No lie.

drpete3

I have them on my dash. Used to run efi engines and had those on the dash too. I still have them ( a pair) and they are livorsi white I would sell if someone is interested.

Wobble

Quality Liquid filled gauge should have a compensation valve to adjust for changing air pressure and temp.

My airgap intake is normally cool to cold.

I also have a permanent oil pressure gauge mounted prior to filter. Lets me see if there are any filter issues. ( if the differential between the dash and engine gauges changes)

searched the liquid filled issue and found this

"Well a subject I finally know a little about! I am the General Manager for the plant that makes many of the fuel rail pressure gauges. I would not use a liquid filled gauge unless the gauge is seeing a lot of pointer flutter while the car is running. Pulsation caused by a mechanical fuel pump can destroy the gauge in short order if it is pulsing with the pump...noted by pointer "flutter". Liquid filled gauges dampen out this pulse by dampining the pressure bourdon tube. In certain applications gauges can fail by tube rupture from a fatigue carck rather quickly...thus the liquid filled option.
The negatives of liquid fill are higher cost, leaks of the fluid, and inacurate readings if the case remains sealed on a low pressure gauge such as a 15 psi gauge for fuel pressure. Yes you can see as much as a 7 psi shift in pressure due to the case being sealed. If you use a liquid filled gauge get one with the fill plug in the 12 o'clock position and poke a small hole in the plug to vent the pressure. Pressure changes as temperature changes.

I hope this helps.

More questions...e-mail me....however I will be out of country for the next 10 days.

Dave62 "

JRider

iTrader: (1)

I did order the liquid filled...oops. SB, you send my 2" super sucker to Krolczyk yet?

Rookie

iTrader: (4)

I'm pretty sure it is. Been on for years.

SB

iTrader: (1)

No. A few more days till I get my stock I'm out of. Are you hurting for it ? I'm still at work if that tells you how backed up we are.