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Author Topic: How much fuel pressure?  (Read 2447 times)
typ34vienna
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« on: May 24, 2012, 14:43:00 pm »
Hey guys,
will mount a new fuel pump with regulator and gauge to my car,
How much psi is the right fuelpressure for the 48IDA carbs?
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richie
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« Reply #1 on: May 24, 2012, 16:03:22 pm »
Quote from: typ34vienna on May 24, 2012, 14:43:00 pm
Hey guys,
will mount a new fuel pump with regulator and gauge to my car,
How much psi is the right fuelpressure for the 48IDA carbs?

I like to use 3.5/4psi if you are using factory needle and seats,if you use the aftermarket 3.0 glass ball  version then I use less as they bleed over easily
cheers richie
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JS
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« Reply #2 on: May 24, 2012, 22:45:34 pm »
Using 3,5psi for years. Would stay away from the glass ball version at all cost.
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stealth67vw
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« Reply #3 on: May 25, 2012, 01:59:07 am »
I've been running 4lbs for a couple months with no problems.
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John Bates
JB Machining Services
1967 street bug 2020lbs w/driver
12.34 @ 108 mph 1/4
7.76 @ 89mph 1/8
John Palmer
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« Reply #4 on: May 25, 2012, 05:20:52 am »
Don't trust the small 0-15# pressure gauges mounted in the heat of the engine compartment, they are not accurate when we expect them to read at the extreme bottom of their range.  Set the regulator pressure with "a real" fuel pump pressure test guage.  If you must use one of the small gauges, turn it over, pop the small rubber plug and drain the liquid.  Then leave it vented "open" to the atmosphere. 
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javabug
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« Reply #5 on: May 25, 2012, 12:51:23 pm »
Quote from: John Palmer on May 25, 2012, 05:20:52 am
pop the small rubber plug and drain the liquid.  Then leave it vented "open" to the atmosphere.  

That's funny, I was going to run a cheap Summit gauge (for effect) and before it got into the car the plug and oil fell out. I figured that was bad, so I tossed it!

So it was really just trying to help me!
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Mike H.

Sven was right.
JS
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Posts: 1628
« Reply #6 on: May 25, 2012, 18:47:34 pm »
You probably did the right thing anyway, I have had many sleepless nights over such a gauge, turned out mine showed different reading with different temperatures in the engine compartment...  Roll Eyes

Installed a proper instrument in the dash with a sender in the back, problem solved.
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