No no no...... a high turnover pump delivering to a LOW differential pressure filter will require LESS amperage at HIGH FLOW .... than a small pump that is 'straining' (almost 'dead-heading') against a high differential pressure filter. Simple 'work' relationship as seen by 'amperage (times volts) draw'.
***"To clarify your point Ritch how much fuel on average should be filtered each day to make a practical difference to fuel quality ?"***
All depends on the nature of the particles, the degree of fungal, etc. contaminiation, etc.
.....On a strictly practical basis, here's a simple eyeball test determined by the 'current health/hygiene' of your actual system:
• WHEN you have hazy
fuel (denotes typically contaminated to a significant amount of 5-10ÁM and above particles), & whatever your total tankage volume, etc., turn on your recirc. system and record the total time
it takes to arrive from a 'hazy' fuel to a 'crystal clear' (≤.5ÁM) resident level.
The 'eyeball test' is done with the fuel in a CLEAR clean glass container and held between your eyeball and STRONG white light. 'Any' haze you can 'visualize' means particle contaminated fuel (above ~5ÁM) .... simply run the system and estimate/record the time it takes to become 'crystal clear' / no haze. (This haze/no haze will be very consistent with 'nephalometry evaluations', etc. that can be correlated with 'particle amounts' - eyeball is just as sensitive.) With a 1-2 gpH pump it will take sometimes many hundreds of hours until clear (per 100 gals). In contrast, about 2-3+ hours at ~3 gals per MIN. per 100 gal. tankage.
Recirculation polishing filtration is all about dilution
(exponential decay) of the number of particles STILL IN
If you had 2 tanks, one empty and one full you could easily filter/pump between them in a 'single pass' high efficiency filtration; but, since the return of a recirc. system only SLOWLY
(volume per time) *dilutes* the amount of tank particles .... youll typically spend many hundreds+++ of hours waiting for such a 'dilution' with a small pump.
- Whats the ~volume of your tank?
- Whats the retention ÁM (and brand) of your recirc. filters?, and
- Whats the pump? (I need to look at its output performance curve vs. backpressure, etc.) Vacuum or pressure feed to filters?
- Whats the (clean) system gage pressure on your recirc. filter?
Then I can make some generalized assumptioins/guesses and then give you a close estimate of how long a 'moderately' contaminated system will take to 'clean-up' ... based on your approximate parameters.
Total Volume gallons, ÁM and 'brand', ID of pump.
Here's a 60 gph / 1 gpm Walbro that 'deadheads' at 2.3 AMPS. Walbro FRB-13 Industrial & Marine Fuel Pump from Fuel-Pumps.net