There are different sizes of the Mr Funnel Prefilters. The big one is pretty quick when the fuel is good. In Namibia the fuel starts to be good - runs trough extremly quickly (shell).
Execpt of one time in Marocco i have always used the Mr Funnel prefilter.
Only once in Congo, they sent me away (shell) because of the gasstation was really busy.
If the fuel wasnt good it need more time for filtering. We often had 30min Pitstops for 100l - but better that than crap in the tanks.
I alway hold the prefilter, while the guys filled the filter. And i always give a very good tip (afterwards). This may help you - they loves the travellers with the prefilters now ;-)
There was only once viewable parts inside of the prefilter, as we filled from canisters.
Sometimes the diesel was yellow, sometimes black - but never viewable part - while refilling from a Gasstation. We had to replace the Dieselfilter in Angola once, and the filter between tank and additional tank was also full with dirt.
So i would use the MrFunnel again, when driving in africa.
Maybe it is overkill on Total or Shell fuel stations - but - i enjoy to know, that i don't have to replace the diesel filter severall times on the way.
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