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Old 01-31-2004, 05:19 PM   #1
Lachlan
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Default gauge question

So I discovered ISSPRO gauges, and they look pretty neat. They have thru-face lighting and for a good price. But the only 0-100 psi fuel pressure gauge they have is 60mm, and I like 52mm gauges. Is it possible to instead use a mechanical oil pressure gauge to measure fuel pressure?

Lachlan
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Old 01-31-2004, 05:29 PM   #2
awdman
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Default Probably...

My question is are you really that keen on having fuel pumped inside your car?
I'm kinda paranoid myself. In theory it should work. Look at drag racers who have only a dial gauge in route with the fuel line. That's mechanical. Just check for leaks!
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Old 01-31-2004, 05:36 PM   #3
Lachlan
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well i would be getting an autometer high pressure isolator with it, as I value my life more than $94
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Old 01-31-2004, 05:52 PM   #4
awdman
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Well done!
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Old 02-02-2004, 09:01 PM   #5
Lachlan
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Ok, as long as we're talking pressure, would it be possible to use an electric oil gauge to measure fuel pressure? An electric oil gauge w/ sender is way cheaper than a mechanical oil gauge with a high pressure isolator. Does the sender care what liquid is in it? I mean as long as its not 6 molar HCl or anything...
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Old 02-03-2004, 12:04 PM   #6
awdman
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Default UNKNOWN!

I think the gauge would "work", but I'm having doubts concerning
accuracy. The consistancy of motor oil and gasoline are obviously different.
Can you ask the gauge manufacturer? I have not heard or seen this application done before. Sorry.
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Old 02-03-2004, 12:39 PM   #7
Lachlan
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I shot ISSPRO an email. We'll see what they say. I wish more people made the gauges that I want without charging me three times what they're worth
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Old 02-03-2004, 05:56 PM   #8
WhatleyWRX
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Being an Instrumentation Engineer, I'll throw out my 2 cents and get flamed back into the stone age...

Pressure is pressure, it will work, fluid properties won't matter with pressure (maybe in a gas, but not a fluid). Although the oil pressure gauge is going to have a much higher range than a fuel pressure gauge (at least I would assume it would).

Is there a large price difference or something?

I'll sit back and wait for the engineering student to quote his fluids book to try and prove me wrong.

Whatley.
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Old 02-03-2004, 06:06 PM   #9
Lachlan
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This is what Scott at ISSPRO said about their sender:

The R8917 is designed for oil or air pressure not for fuel. We are in the process of testing a fuel pressure sender for the transfer pump on the late model Dodge. Our senders will leak if installed after the main pump due to pressure spikes.

So I guess there's a difference.

My reason for wanting to do this is that ISSPRO only makes a 60mm mechanical fuel pressure gauge, not a 52mm electrical. Even with the mechanical gauge I have to get a high pressure isolator so that's $30 for the gauge and $100 for the sender compared to a $67 electrical gauge with sender. So I guess I'll either have to wait or get a fuel pressure gauge that doesn't match.
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