Fuel pressure question
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Laughing Gas
Joined: Oct 2010
Posts: 997
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From: Rock Valley, IA
Fuel pressure question
I have 3/8" hose running throughout my truck. I am going to test the fuel pressure tonight but the tester has a 1/8" orifice. Now, doesn't going from a bigger to smaller orifice cause pressure to go up and hence give me a false reading? Or is it just the velocity of the fluid increases but the pressure stays the same? Just curious about this.
Posting Guru
Joined: Jan 2012
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From: Dallas, GA
I have 3/8" hose running throughout my truck. I am going to test the fuel pressure tonight but the tester has a 1/8" orifice. Now, doesn't going from a bigger to smaller orifice cause pressure to go up and hence give me a false reading? Or is it just the velocity of the fluid increases but the pressure stays the same? Just curious about this.
They put the orifice in there to dampen pulsations so that you will have a smoother reading rather then it bouncing all over everytime the diaphagm strokes on the FP.
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Laughing Gas
Joined: Oct 2010
Posts: 997
Likes: 2
From: Rock Valley, IA
OK. Thank you Kevin. I didn't think they would make a 1/8" orifice without first thinking of the obvious (who has a 1/8" fuel hose???). I should have realized this to begin with but just wanted to get confirmation. Thanks again. Reps to you.
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