Therambleman Posted December 15, 2020 Share Posted December 15, 2020 Hi all, I have searched multiple forums and groups and can't find a straight answer. Any help appreciated. I have triple 45s on an l28 (77 260z 2+2) Want to put a fuel regulator with a bypass in the bay to hopefully reduce fuel smell in cabin, remove deadhead setup on the carbs, and stop fuel pump overworking. From what I've read – I need 3-4PSI for Weber 45s. For the life of me, I can find a fuel regulator that has a bypass and also runs under 4psi and is less than $400 and in the US only!! All the Holley ones are 4.5-9psi. Can you actually crank those down to below 4psi? Or is there another regulator somewhere – or am I dreaming? Apologies if I'm missing something obvious or if this has been covered elsewhere – have spent hours searching! Cheers Quote Link to comment Share on other sites More sharing options...
RLY240 Posted December 15, 2020 Share Posted December 15, 2020 Something like this? I run one of these on my triples but with no return line. Carter electric pump. HOLLEY RED FUEL PRESSURE REGULATOR. 1 TO 4 PSI. GENUINE FITS HOLLEY - HO12-804 | eBay Quote Link to comment Share on other sites More sharing options...
Therambleman Posted December 15, 2020 Author Share Posted December 15, 2020 Thanks for the reply - yeah I’m wondering if there’s a regulator like that - but operates at that low psi AND also has a return. Perhaps it’s not a thing?? Quote Link to comment Share on other sites More sharing options...
Roady Posted December 15, 2020 Share Posted December 15, 2020 (edited) There are 3 holes, 1 input, 2 output. I use one output to Weber’s the other attached to a pressure gauge. You could possibly use the second as a return line. Not sure if the smaller diameter of the return line would create enough of a pressure differential to feed the carbies. Alternatively, have the return line from the end of the Weber’s if you so choose?? Edited December 15, 2020 by Roady Quote Link to comment Share on other sites More sharing options...
RLY240 Posted December 15, 2020 Share Posted December 15, 2020 51 minutes ago, Therambleman said: Thanks for the reply - yeah I’m wondering if there’s a regulator like that - but operates at that low psi AND also has a return. Perhaps it’s not a thing?? I used to run this reg with the factory fuel rail, reg in line before the carbs, one feed into carb one and the other feed into carb three with all three carbs linked together and the factory Return line back to the tank. seemed to work fine but you might be able to fine a proper bypass reg at that low a pressure but I haven’t seen one. Quote Link to comment Share on other sites More sharing options...
Therambleman Posted December 15, 2020 Author Share Posted December 15, 2020 @Roady @RLY240 thanks guys! 2 good options. Roady – I was trying to allow the fuel pump to pump its heart out to not over stress it but maybe I'm being overly cautious.So if I just have the non bypass regulator plumped in after the webers, the pressure in the webers should be perfect, and when thay are not sucking fuel it just runs through and back to the tank. Not sure why it's been so hard for me to wrap my head around this! Either way – I'll keep looking for a low pressure regulator with a return and reply to this thread if I find one. Rly - I had not thought of that, I think you've cracked it. That setup would mean less stress on fuel pump, consistent pressure at webers and a has a return. Noice. Quote Link to comment Share on other sites More sharing options...
Therambleman Posted December 16, 2020 Author Share Posted December 16, 2020 Would this do what I'm after? https://www.weberperformance.com.au/product_info.php?cPath=59_276_277&products_id=1211 @RLY240 where does your return line come out? My dumb head can't figure out how this isn't essentially a deadhead setup? Quote Link to comment Share on other sites More sharing options...
AndBir Posted December 16, 2020 Share Posted December 16, 2020 49 minutes ago, Therambleman said: where does your return line come out? The factory fuel rail has the return built into it. Quote Link to comment Share on other sites More sharing options...
RLY240 Posted December 16, 2020 Share Posted December 16, 2020 (edited) Quote: The factory fuel rail has the return built into it. yes this. The factory hard line has a restrictor in the return line. If you don’t use a bypass reg you need to put it before the carbs in the circuit as you have in your diagram Roger Edited December 16, 2020 by RLY240 Quote Link to comment Share on other sites More sharing options...
Agno Posted December 16, 2020 Share Posted December 16, 2020 9 hours ago, Therambleman said: Would this do what I'm after? https://www.weberperformance.com.au/product_info.php?cPath=59_276_277&products_id=1211 My brother uses one of these in his IDA 13B RX7. They work well but your pump MUST supply fuel to it at a lowish pressure, they get overwhelmed if the supply pressure is over 10psi. Quote Link to comment Share on other sites More sharing options...
Therambleman Posted December 16, 2020 Author Share Posted December 16, 2020 11 hours ago, Agno said: My brother uses one of these in his IDA 13B RX7. They work well but your pump MUST supply fuel to it at a lowish pressure, they get overwhelmed if the supply pressure is over 10psi. Thanks – roger that. I'll figure out what my pump puts out first. I found another one that is low pressure and has a return but it was about $500 and in the US. Noooope :-/ Quote Link to comment Share on other sites More sharing options...
Agno Posted December 17, 2020 Share Posted December 17, 2020 Try this one: https://www.efihardware.com/products/261/lift-pump-340hp-Rollercell Quote Link to comment Share on other sites More sharing options...
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