If the pre pump filter has the same size hose on both sides then it was the original that should have been removed during the first service. If it uses a smaller hose for the inlet then the one to the pump then your tank has been replaced with one of the low cost replacements and the filter is also being used as an adapter. The larger filter after the pump is designed to filter on the pressure side. This allows for finer filtration and eliminates the filter as a cause of vapor lock and pump cavitation. It also increases service intervals. If the tank is loaded with crud the real fix is going to be replacing it as the crud is from the tank itself failing. At some point cleaning it will only delay the replacement as the next step will be leakage. Dennis -----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Troy Sent: Monday, February 20, 2012 4:05 PM To: vanagon@GERRY.VANAGON.COM Subject: gasoline prefilter Hi folks: I have an 89 vanagon westy. I have a square prefilter before the main canister fuel pump, and I'm told this is not a stock set up. I have also read in various posts how rust/sediment in the tank can get lodged in the fuel pump, so wondering if I should just leave the square prefilter in place when I replace my fuel pump. Is there any harm to doing this? It apparently has been working fine for years this way. Troy |
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