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How do I adjust the presure in the glass bowl type regulator and if haven't got gauge how many turns in what direction to go weaker or stronger. Suppose there are more than than one type glas bowl regulator ?
Alfa gtv 1750
Thanks
Hendrik van Graan
 

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Without a gauge really hard to tell. There is a screw on top (in the middle), which is locked with a small nut => Clockwise means less pressure.
 

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The " FILTER KING" has been adjusted for pressure corresponding to the top performance of the relative engine. The fuel-flow has been calculated by taking into consideration the diameter of the float needle valve and the capacity of the float bowl of the carburettor. If it should prove necessary to alter the fuel pressure to the carburettor, act as follows: If the fuel pressure is to low take off the blind cap nut, loosen the opposite lock nut and turn the adjusting screw half a turn in clockwise direction. If however the pressure should be too high act as before but turn the adjusting screw counter clockwise always only for half a turn. This adjustment has to be done gradually until the ideal pressure will be reached. If there should be stalling or starvation under acceleration, or at high speeds, the pressure always has to be increased by turning the adjusting screw gradually by half a turn in clockwise direction. When the setting of the screw is made, be sure to tighten the lock nut carefully, so that the position of the adjustment screw is not changed, then install cap nut and tighten. The " FILTER KING " is warranted for perfect function. It is made under control of the best of materials and workmanship and will perform, giving benefits of economy and performance for many years of trouble-free-service.

this was from Filter Kings own web info. It looks like Clockwise increases pressure. Half-turn at a time is the go.
 
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