fuel pressure gauge

[ssrodder]

Looking for a source to purchase a five or ten pound liquid filled fuel pressure gauge. All I can find are fifteen pound gaugues. Would prefer a five pound gauge. I am installing webers in my 82 and from what I have read the pressure should be set at 3.5 pounds.

[brads911sc]

The ones I have seen show every pound as its own line, some even show in greater detail. why isnt a 15 pound one fine? I havent seen ones lower than 15 pound.

[teenerted1]

http://www.jegs.com/webapp/wcs/stores/servlet/KeywordSearchCmd?storeId=10001&catalogId=10002&langId=-1&N=4294965293&Ne=1147708&searchType=KeywordSearch&Ntt=%5EFuel+Gauge%5E&Ntk=PartType_x&Nty=1&Ntx=mode+matchboolean

[David]

I'll second the jegs (or summit) stuff. I bought a so-called specialty gauge from a fuel injection site and it didn't last a month. My redneck looking summit gauge is still going strong after a few years.

[ssrodder]

The reason I would like a five pound gauge is that 3.5 pounds in the middle of the scale. On a fifteen pound gauge it is at the lower end. I just feel the accuracy of a five pound gauge would be better.

[RoninLB]

this group of gauges are more accurate at center range. Movement from center slightly increases error % till max error at range limit.

ie: the best gauge for 3.5psi is a 0-7 ga

I use a dry 5# with a needle damper orifice. It's large and cost about $50. It reads fine. Much better than a 0-15 for me.

Moderator john_cramer found a different german 5#.

member Souk is pretty much the last word around here for hydraulics and gauge tech for our cars.




anyway, this is my act












the wire wrapped next to the bulkhead is for 3in1 fuel psi gauges to replace clock



.

[JP911]

IMO, a 15 psi gauge is more than adequate for your application. 3.5 psi is the target, but it's not as if 3.4 or 3.6 psi is going to make the car run differently.

[RoninLB]

Originally Posted by JP911

IMO, a 15 psi gauge is more than adequate for your application.

I agree

[MotoSook]

I was recently involved with some work where we manifold an analog gauge and a digital gauge together to measure the same pressure. The analog gauges we use in our line of work are suppose to have great accuracy, and we even chose the gauge range to fit the pressure (i.e. 0-30 psig for 20 psig target). During the work the analog was off by more than 3 pounds while the digital gauge appeared to be spot on. The digital gauge was NIST traceable, so I have to accept that it was accurate.

Having said that you all should understand that the pressure recommended for your carbs is not an exact value that works for every carb system. The 3.5 psig or what ever it is should be a good start, then tune your pressure to what makes your carbs perform best. Just don't get some junk gauge with bad repeatablilty, and use the gauge for 20-80% of range reading.

Hey Ronnie!