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Old 07-11-2010, 06:34 PM
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Fuel Pressure Gauge

I Just Got A 71 El Camino 350 Its Got A 750 Holley With A Dual Feed And Has A Pressure Gauge. The Needle Fluctuates A Lot When Running. Cant See The Needle Fippin So Bad. The Car Runs Steady So Im Leanin Toward A Defective Gauge. Iv Had These Before But Always Had A Steady Needle. Thanks Gary

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Old 07-11-2010, 06:58 PM
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More then likely it is just the gauge, Mine done the same thing swithed it out and now it works just fine.JMO


Cole
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Old 07-11-2010, 07:19 PM
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Topic related info:
The oil-filled gauges are good for vibration environments like when engine mounted. The problem with the oil-filled gauges is that they are a sealed design to keep the oil inside. This makes the gauge reading change with different temperatures. My oil-filled gauge will read 7 psi when cold but only about 3 psi when heated by the engine. The pressure inside the gauge changes. To fix this, there must be a way of relieving that pressure back to atmospheric.
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