Fuel pressure gauge. HELP ASAP
#16
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If you doubt the need for a needle valve then just try it. Infidel, of course, is dead on with his explination. As he said a 24v will buzz but the 12v will dang near blow the gauge apart.
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#19
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Is it because the frequency of the pulsations from the injection pump is a lot higher than the response time of the gauge? Thus, stressing the gauge and blowing it?
#20
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On the 12 valve it's the mechanical lift pump that causes the pulsations. It's a diaphragm type pump, one stroke sucks fuel in, next stoke expels it. Envisioning this you can see how the pulsation develops. Without a dampener the needle will swing from zero to over 50 psi on each stroke of the lift pump, the faster the rpms the faster the swing. The needle valve slows the pressure change the gauge sees so what it is in fact doing is taking the average between the high and low psi.
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