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Author Topic: Fuel pressure gauge  (Read 9025 times)

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Offline JoeBlystfk

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Fuel pressure gauge
« on: October 12, 2012, 08:35:50 PM »
Perhaps a dumb question, but how does the rule that says no parts of the fuel system may be in the cockpit affect the installation of a mechanical fuel pressure gauge in the dash ?
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Offline Captthundarr

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Re: Fuel pressure gauge
« Reply #1 on: October 12, 2012, 08:42:05 PM »
Elecrtic gauge or an isolation adaptor between the line with fuel and the gauge. see Summit, Jegs ect.
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Offline Stainless1

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Re: Fuel pressure gauge
« Reply #2 on: October 12, 2012, 09:41:54 PM »
The one in the liner has glycerin in the line between the isolator and gauge
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Offline manta22

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Re: Fuel pressure gauge
« Reply #3 on: October 12, 2012, 09:42:52 PM »
That's not a dumb question at all... the purpose of a fuel pressure isolator is to keep a ruptured gauge line from spraying fuel into the cockpit. The isolator itself must be mounted outside the cockpit or the whole purpose is compromised.

Regards, Neil  Tucson, AZ
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Regards, Neil  Tucson, AZ

Offline JoeBlystfk

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Re: Fuel pressure gauge
« Reply #4 on: October 12, 2012, 10:33:53 PM »
That's why I love the internet.....thanks
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Offline maguromic

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Re: Fuel pressure gauge
« Reply #5 on: October 12, 2012, 10:51:57 PM »
You should also use line isolators on your oil line and hydraulic clutch line.  A friend of mine made this up for my vintage race car I road race. It does the fuel, oil and the hydraulic clutch in one small unit (4" x 1 1/2") and mounts to the firewall and has the bleeders on the firewall side. Tony

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Offline Captthundarr

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Re: Fuel pressure gauge
« Reply #6 on: October 13, 2012, 11:51:36 AM »
Tony, you have the coolest stuff,and the avitars are't either. :-D
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Offline Dean Los Angeles

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Re: Fuel pressure gauge
« Reply #7 on: October 13, 2012, 12:31:10 PM »
The value of a fuel line isolator for safety is obvious.
The value of the gauge . . . I can see that you would want fuel pressure going to the data logger. Why do you need it during a run? I'm thinking you are pretty busy to even look at it.
What is the advantage of a mechanical gauge over an electric gauge?
The isolator adds complexity, cost, and another component that can break. Sure, the electric requires a sending unit that can fail, but wiring to a gauge beats plumbing.
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Offline hotrod

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Re: Fuel pressure gauge
« Reply #8 on: October 13, 2012, 09:33:54 PM »
The other advantage of an electrical fuel pressure gauge is you can wire up a low fuel pressure warning light in a high visibility location.
That will get the drivers attention with a lot less focused mental effort than trying to watch the gauge during a run.

Then if the light comes on the driver can glance at the gauge to confirm he/she has a real problem and abort if true.

Larry
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Offline JoeBlystfk

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Re: Fuel pressure gauge
« Reply #9 on: October 13, 2012, 10:28:54 PM »
Well its about a flat head with 97s and a magneto and mechanical fuel pump and an old guy that says we should have a fuel pressure gauge. Data logger......what's that.. :-D
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Offline jl222

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Re: Fuel pressure gauge
« Reply #10 on: October 13, 2012, 11:13:35 PM »
Quote from: JoeBlystfk on October 13, 2012, 10:28:54 PM
Well its about a flat head with 97s and a magneto and mechanical fuel pump and an old guy that says we should have a fuel pressure gauge. Data logger......what's that.. :-D

   :-D  JL222
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Offline Milwaukee Midget

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Re: Fuel pressure gauge
« Reply #11 on: October 14, 2012, 11:21:39 AM »
Quote from: JoeBlystfk on October 13, 2012, 10:28:54 PM
Well its about a flat head with 97s and a magneto and mechanical fuel pump and an old guy that says we should have a fuel pressure gauge. Data logger......what's that.. :-D

Ahh, vintage data logger for flat heads - a pencil, a pad of paper, a theodolite and a sun dial.  :wink: 

From what I understand about 97's, you don't want to overpower them with fuel pressure, which I just looked up - 2 1/2-3 psi max - same as a DCOE Weber.  What I wound up doing is putting a fuel pressure gauge under my hood after the regulator so I can check it when tuning.  If you think you need it, I'd plumb in a pressure switch and an idiot light.

 
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Offline Tman

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Re: Fuel pressure gauge
« Reply #12 on: October 14, 2012, 11:46:36 AM »
Quote from: Milwaukee Midget on October 14, 2012, 11:21:39 AM
Quote from: JoeBlystfk on October 13, 2012, 10:28:54 PM
Well its about a flat head with 97s and a magneto and mechanical fuel pump and an old guy that says we should have a fuel pressure gauge. Data logger......what's that.. :-D

Ahh, vintage data logger for flat heads - a pencil, a pad of paper, a theodolite and a sun dial.  :wink: 

From what I understand about 97's, you don't want to overpower them with fuel pressure, which I just looked up - 2 1/2-3 psi max - same as a DCOE Weber.  What I wound up doing is putting a fuel pressure gauge under my hood after the regulator so I can check it when tuning.  If you think you need it, I'd plumb in a pressure switch and an idiot light.

 

Thats how we have our setup wih the Y-block. Besides, you WILL KNOW if you lose pressure anyway!
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Offline JoeBlystfk

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Re: Fuel pressure gauge
« Reply #13 on: October 14, 2012, 04:02:55 PM »
Ok dumb question number two.
Rule 3 k says all vehicles must have a main battery shut off switch. What do you hook it to if you aren't running a battery ?
We are just going to plug in a battery to get the thing started and then it goes in the push truck.
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Offline hotrod

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Re: Fuel pressure gauge
« Reply #14 on: October 14, 2012, 05:36:26 PM »
I would suspect that would mean you would need a positive method to kill all system electrical power -- kill alternator power (assuming you have an alternator) and to cut off ignition (assuming you have a magneto). In short a positive method to stop the engine.

Larry
« Last Edit: October 14, 2012, 05:55:34 PM by hotrod »
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