Do you know why you should have a quality gauge to match your quality fuel system?
Listen to our senior technician explain why you should invest in a quality gauge for your fuel system.
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A crucial part of owning a performance engine is knowing the requirement for proper fuel flow and
pressure, then researching to find a fuel system able to meet those requirements. Engine
performance and reliability depend on this. After having invested in and installed a quality fuel
system, to then find that the gauge is making fuel pressure appear out of control, unstable and
unpredictable, is surprisingly common, not to mention alarming and frustrating.
Finding a fuel pressure gauge that is accurate, reliable and affordable proves to be a surprisingly difficult
job, more so than most enthusiasts realize. From large to small, mechanical to electric, mounted underhood, on the cowl or ultimately in the car, the options and the cost can be confusing and prohibitive.
Of the many gauges on the market, performance enthusiasts historically prefer the simpler, less expensive
mechanical gauge, usually smaller and mounted on the regulator, under the hood. Of this type, the liquid,
or "oil filled" version is the most popular. Something about an oil filled gauge has that "diamond in the
rough" look, adding to the sense of precision and purpose a serious fuel system gives a powerful engine.
Indeed, an "oil filled" gauge is tougher and more durable than a "dry" gauge, with the oil protecting the
precision internals from shock and vibration, which explains why fewer and fewer dry gauges are offered
for performance engines today. And there's no arguing that a liquid filled gauge looks like a higher
quality instrument. Unfortunately, there's a hidden "gotcha" that users of this type of gauge experience, a
reported lack of accuracy, or consistency, is common. In fact "oil filled" fuel pressure gauges do exhibit
seemingly random pressure swings from 1-9 PSI. This is a fuel pressure "yellow-flag" for EFI engines
running 40-60 PSI of fuel pressure, and a "black-flag" for carbureted engines running as little as 2-10 PSI.
The problem is one of physics, where the mechanism that moves the needle, called the Bourdon Tube, is
submersed in a liquid (most commonly glycerin) that is used to fill the gauge case that houses it, and then
sealed. The finished product is a beautiful, durable fuel pressure gauge that has a maddeningly mysterious
tendency to "read all over the place". The most disconcerting aspect of this is nobody really sees the
needle actually move, it just never quite seems to read the same pressure from one look to the next.
Obviously this leads the owner or tuner to believe there must be something seriously wrong with their fuel
system. Logically, most figure the regulator is the culprit and from there things can go downhill fast!

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