zetec Posted May 25, 2014 Share Posted May 25, 2014 Please Link to comment Share on other sites More sharing options...
Guy Lowe Posted May 25, 2014 Share Posted May 25, 2014 Fit a swirl pot Guy Link to comment Share on other sites More sharing options...
zetec Posted May 25, 2014 Author Share Posted May 25, 2014 Where can put the fuel return into the tank? Oh & the breather? Link to comment Share on other sites More sharing options...
Pendennis Posted May 25, 2014 Share Posted May 25, 2014 Return goes back to surge pot, breather is maintained in low pressure standard fuel tank Link to comment Share on other sites More sharing options...
Guy Lowe Posted May 25, 2014 Share Posted May 25, 2014 Craig, why not come over one day/evening next week and I'll show you how I 'plumbed' mine, it's so simple or I could come over to you tomorrow if it's dry Guy. Link to comment Share on other sites More sharing options...
keybaud Posted May 25, 2014 Share Posted May 25, 2014 Quoting Guy Lowe: Fit a swirl pot Guy Your pressure regulator won't work properly, if one side isn't to atmospheric pressure. It doesn't know that you have pressurized both sides of the regulator, so can't maintain the correct pressure to the injectors. Link to comment Share on other sites More sharing options...
Guy Lowe Posted May 25, 2014 Share Posted May 25, 2014 Quoting keybaud: Your pressure regulator won't work properly, if one side isn't to atmospheric pressure. It doesn't know that you have pressurized both sides of the regulator, so can't maintain the correct pressure to the injectors. Yes it will because with a swirl pot you always have an atmospheric vent back into the fuel tank. Guy Link to comment Share on other sites More sharing options...
keybaud Posted May 25, 2014 Share Posted May 25, 2014 Quoting Guy Lowe: Quoting keybaud: Your pressure regulator won't work properly, if one side isn't to atmospheric pressure. It doesn't know that you have pressurized both sides of the regulator, so can't maintain the correct pressure to the injectors. Yes it will because with a swirl pot you always have an atmospheric vent back into the fuel tank. Guy The OP doesn't have an injection tank, so he doesn't have a return and people keep telling him to use a swirl pot instead. Edited by - keybaud on 25 May 2014 21:57:05 Link to comment Share on other sites More sharing options...
Pat the Plumber Posted May 25, 2014 Share Posted May 25, 2014 I have an injection fuel tank Link to comment Share on other sites More sharing options...
Guy Lowe Posted May 25, 2014 Share Posted May 25, 2014 Quoting keybaud: The OP doesn't have an injection tank, so he doesn't have a return and people keep, telling him to use a swirl pot instead. that's the whole idea of a swirl pot, it does away with the need for an injection tank Link to comment Share on other sites More sharing options...
zetec Posted May 25, 2014 Author Share Posted May 25, 2014 superb, nice & clear now. thanks guy,i might sneak over at some point or are you going to rehab thurs? Link to comment Share on other sites More sharing options...
keybaud Posted May 25, 2014 Share Posted May 25, 2014 Quoting Guy Lowe: Quoting keybaud: The OP doesn't have an injection tank, so he doesn't have a return and people keep, telling him to use a swirl pot instead. that's the whole idea of a swirl pot, it does away with the need for an injection tank An injection tank is a tank with a return, that's all. I thought a swirl pot needed a return to the tank still. /edit I had a brain fail. Edited by - keybaud on 25 May 2014 23:04:50 Link to comment Share on other sites More sharing options...
Guy Lowe Posted May 26, 2014 Share Posted May 26, 2014 keybaud Yes an injection tank does have a fuel return but it also has the facility to fit a HP pump inside the tank. Rather than change the tank some people (me) use an external LP pump to feed a swirl pot, which in turn feeds an external HP pump which feeds the injectors. The return from the fuel rail then goes back to the swirl pot via the pressure regulator. Surplus fuel is returned to the tank via an atmospheric vent from the top of the SP. To do this I simply fitted a banjo in the back plate of the gauge sender unit. Not sure it was any cheaper/easier than changing the tank but it was what many L7C members who had converted to injection recommend. Guy. Edited by - Guy Lowe on 26 May 2014 03:14:51 Link to comment Share on other sites More sharing options...
Guest Posted May 26, 2014 Share Posted May 26, 2014 If it's any help, I can make you an aluminium fuel tank with a flow and return. I usually make them with a sump with the flow and return located in the sump to prevent fuel surge. I just need the dimensions. I'd suggest making it as big as possible so you don't have to make so many stops while touring. BM me with the dimensions. Link to comment Share on other sites More sharing options...
keybaud Posted May 26, 2014 Share Posted May 26, 2014 Quoting Guy Lowe: keybaud Yes an injection tank does have a fuel return but it also has the facility to fit a HP pump inside the tank. Rather than change the tank some people (me) use an external LP pump to feed a swirl pot, which in turn feeds an external HP pump which feeds the injectors. The return from the fuel rail then goes back to the swirl pot via the pressure regulator. Surplus fuel is returned to the tank via an atmospheric vent from the top of the SP. To do this I simply fitted a banjo in the back plate of the gauge sender unit. Not sure it was any cheaper/easier than changing the tank but it was what many L7C members who had converted to injection recommend. Guy. Edited by - Guy Lowe on 26 May 2014 03:14:51 Why couldn't you achieve the same thing with an external HP pump to the injectors and the return to the tank? I'm just confused why in every post zetec has made, everyone tells him to fit a swirl pot, which is an option, not a necessity. What he really needs is a return to the tank, after which he can choose whether he needs a swirl pot or not. Edited by - keybaud on 26 May 2014 10:59:01 Link to comment Share on other sites More sharing options...
revilla Posted May 26, 2014 Share Posted May 26, 2014 I think it's to prevent fuel surge problems; if there was just a takeoff pipe to a high pressure pump, it wouldn't cope with the pipe being uncovered as fuel sloshed around in the tank. The injection tanks, as well as having the pump in the tank, I believe are baffled to help avoid this. Carb systems don't have such a problem with it (due to the reservoir of fuel in the float chambers?). Link to comment Share on other sites More sharing options...
phil 01 Posted May 26, 2014 Share Posted May 26, 2014 Note,to pat the plumber did you receive my blatmail? Phil Edited by - phil 01 on 26 May 2014 16:06:46 Link to comment Share on other sites More sharing options...
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