Shug Posted July 7, 2012 Share Posted July 7, 2012 If the fuel pump (b gte) has an inlet of about 12mm, why are the fuel filter barbs 8mm? Kinda defeats the purpose of larger fuel pump inlet, no? Quote Link to comment Share on other sites More sharing options...
mantadoc Posted July 7, 2012 Share Posted July 7, 2012 Well the large bore from the tank is for high volume, low pressure, the outlet of the pump is the same size as the fule filter, so thisis high pressure. No point having the pump outlet bigger than the rest of the fuel system and no point having the pump outlet as big as the inlet, it would be much harder for the pump to maintain the pressure. Thinnk of it like this, pressure is about quashing a big thing into a smaller space, then the smaller lines on the rest of the system make sense. Just like your brake line to master cylinder size ratio if you like. Or you could think of it a different way........... The large bore from tank is essentially gravity or "air pressure fed" so, at sea level, the pump can suck but there is still only 1 bar forcing fuel into the pump. No matter how big or how fast it turns that is the greatest pressure differential you will get. so if you tried to make pressure on an outlet the same size you would probably just end up with cavitation where the pump keeps liquid "tied up" within it's vanes so it just spins in time with the pump not moves through it. Quote Link to comment Share on other sites More sharing options...
Shug Posted July 7, 2012 Author Share Posted July 7, 2012 As fuel has to be filtered before the pump, I'd be going from 12 to 8 mm, back up to 12 to the pump. Seems a bit pointless. Quote Link to comment Share on other sites More sharing options...
spiney_norman Posted July 7, 2012 Share Posted July 7, 2012 Filter goes after the pump Shug. There's a pre-filter before the pump in standard GTEs but I've been running my Cav without one and it's fine. Quote Link to comment Share on other sites More sharing options...
Rab Posted July 7, 2012 Share Posted July 7, 2012 Shug, its like yae sticking yur finger ower garden hose. Quote Link to comment Share on other sites More sharing options...
Shug Posted July 7, 2012 Author Share Posted July 7, 2012 I did say it was a stupid question! Just seemed to defy logic that they would protect injectors with a 2 quid filter, and protect a 100 quid pump with hope and a prayer......... Quote Link to comment Share on other sites More sharing options...
simon p Posted July 7, 2012 Share Posted July 7, 2012 I did say it was a stupid question! Just seemed to defy logic that they would protect injectors with a 2 quid filter, and protect a 100 quid pump with hope and a prayer......... I always use something like this if i'm fitting a high performance(and expensive) pump http://www.ebay.co.u...=item231f2ae32c Quote Link to comment Share on other sites More sharing options...
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