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post #1 of 6 (permalink) Old 03-25-2012, 12:41 PM Thread Starter
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76 silver shadow fuel pressure ?

new fuel pump,carbs rebuilt ,car runs fine until you floor it ,after about 7-10 seconds it falls flat like its out of gas ,keeps running just doesnt gain anymore speed,then if I power brake it same thing happens ?im thinking fuel restiction somewhere I want to test fuel pressure but cant find any numbers of what it should be
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post #2 of 6 (permalink) Old 03-25-2012, 03:00 PM
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A Shadow II fuel pump should deliver 48" of head with a flow rate of 4 pints per minute (that's imperial; 4.8 pints in the US, or 2.27 litres if you've gone "modern").

Can't say for a Shadow I. Have you looked in the workshop manual? (It's available online at http://rrtechnical.info/ .)

Cheers,
Jeff.
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post #3 of 6 (permalink) Old 03-25-2012, 09:04 PM Thread Starter
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what fuel pressure in lbs ??
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post #4 of 6 (permalink) Old 03-26-2012, 07:24 AM
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According to: http://www.engineeringtoolbox.com/pu...ure-d_663.html :
Quote:
p = 0.434 h SG (1)

where

p = pressure (psi)

h = head (ft)

SG = specific gravity
48" = 4', SG of petrol is ~ 0.71, all of which gives: 1.23 psi.

Jeff.
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post #5 of 6 (permalink) Old 03-26-2012, 09:08 PM Thread Starter
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yeah it was 2-4 lbs i found all 3 fuel filters were clogged with fine rust/silt this was after i cleaned tank out ,all is good now
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post #6 of 6 (permalink) Old 03-27-2012, 02:55 PM
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While you're there, you might want to check the little o-rings around the brass tube that goes from the carb filter housings into the carb bodies. Mine leaked on both carbs....

Anyway, always happy to hear of a good outcome.

Jeff.
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