how much more does the high volume pump flow compared to the standard gss307? i have the chance to get the standard one for 80 bucks or the high volume for 90, is it worth the extra 10 bucks?
Sorry for being vague. The GSS340 allows the use of an FMU. The GSS340 is high pressure, meaning it will maintain 255lph up to 90psi fuel pressure. If you will not be using an FMU use the GSS307 as it will maintain 255psi up to 50-60psi fuel pressure. At 35-60 PSI they are the same volume. At 60psi+ the GSS307 drops off volume because it is not a high pressure unit.