Fuel pump flow rates and current draw at 12 volts

Pressure (psi) GSS242 190 ltr/hr (gal/hr) GSS242
190 ltr/hr (amps)		 GSS307 
255 ltr/hr (gal/hr)		 GSS307
255 ltr/hr (amps)		 GSS340 255 ltr/hr (gal/hr) GSS340 255 ltr/hr (amps)
0 56 2.6 75 4.7 76 4.4
10 52 3.2 72 5.2 73 4.8
20 48 4.0 67 6.1 68 5.5
30 44 4.8 63 7.2 63 6.3
40 40 5.7 58 8.3 59 7.1
50 36 6.6 54 9.4 54 8.0
60 32 7.6 49 10.6 50 8.9
70 28 8.6 40 11.8 45 9.8
80 22 9.7 29 13.3 37 10.8
90 12 10.8 0 14.6 27 11.8
100 0 12.5

11 12.9
110



1 13.9

Fuel pump flow rate and current draw at 13.5 volts

Pressure (psi) GSS242 190 ltr/hr (gal/hr) GSS242
190 ltr/hr (amps)		 GSS307 
255 ltr/hr (gal/hr)		 GSS307
255 ltr/hr (amps)		 GSS340 255 ltr/hr (gal/hr) GSS340 255 ltr/hr (amps)
0 64 3.1 83 5.5 84 5.1
10 61 3.5 81 5.8 82 5.4
20 57 4.2 77 6.7 78 6.1
30 53 5.0 72 7.7 73 6.8
40 50 5.8 68 8.8 68 7.6
50 46 6.6 64 9.8 64 8.4
60 43 7.5 58 10.9 59 9.2
70 39 8.4 51 12.0 55 10.1
80 32 9.4 39 13.2 46 10.9
90 23 10.3 12 14.4 38 11.9
100 15 11.5 1 15.3 19 12.9
110 0 12.7

9 14.0

Actual numbers can vary. Data in these tables are from Walbro. Numbers are the average of 10 pumps selected at random from the production lines of the GSS242 [190 ltr/h], GSS307 [255 ltr/hr], and GSS340 [high pressure 255].

HORSEPOWER SUPPORT:
Using the formula (HP) = lb/hr (fuel) / BSFC. If you assume BSFC of .5, and a fuel weight of 6 lb/gal, then HP = 12 * gal/hr.  With this you can simply multiply the numbers in the flow charts by 12 to compute supported horsepower.