gorillaman2012 Posted August 4, 2014 Share Posted August 4, 2014 Alright yall looking for some advice on a good regulator for my z. Looking for one I can use the mechanical pump and use the bypass system so I have a return to the tank. Thanks! Quote Link to comment Share on other sites More sharing options...
Six_Shooter Posted August 8, 2014 Share Posted August 8, 2014 (edited) Since you want to use the mechanical pump, I assume this is a carburetted set-up? If so, you shouldn't need a regulator, when using the mechanical pump. Edited August 8, 2014 by Six_Shooter Quote Link to comment Share on other sites More sharing options...
Tony D Posted August 8, 2014 Share Posted August 8, 2014 The stock system already uses a return line and calibrated orifice to allow for variable fuel pressure at variable RPM/Load Conditions. Have you removed the FO and gone with a deadheaded fuel rail or something? Why would you need a fuell pressure regulator with the stock setup? Quote Link to comment Share on other sites More sharing options...
gorillaman2012 Posted August 11, 2014 Author Share Posted August 11, 2014 Well its not exactly a stock carb system. It's actually a holley 4 barrel turbo setup. What all pressure is stock with the return line and all? Quote Link to comment Share on other sites More sharing options...
Tony D Posted August 11, 2014 Share Posted August 11, 2014 Well all, tell all us all a bit more about your all Holley Four Barrel turbo and all... Quote Link to comment Share on other sites More sharing options...
gorillaman2012 Posted August 11, 2014 Author Share Posted August 11, 2014 Hahah I do say that a lot. To be serious though the setup I bought from a member here and was told he ran a 390cfm holley 4 barrel carb on it. Well I got it all put together and at the moment the fuel line is direct from the mechanical pump to the carb. Went to go and turn it over and the carb dumped fuel in like crazy from being over pressurized. Now I'm just trying to find a regulator so it doesn't to that but also uses the return line so the extra fuel has a place to go so I don't wear out the pump to soon. Quote Link to comment Share on other sites More sharing options...
Tony D Posted August 12, 2014 Share Posted August 12, 2014 Make sure the Holley Floats aren't stuck down from being bashed about in shipping. Then get a gauge on the line, 3.5psi is enough..,and that's about all you should get if you had the return line installed with the orifice (2mm?) Now, you say "turbo setup" which to me means you got a huffed on there, in which case a boost-pressurised regulator will be necessary, and the mechanical pump chamber will need a boost reference line to up pressure under boost as well... Meaning "more complete information on the setup, please"... Quote Link to comment Share on other sites More sharing options...
gorillaman2012 Posted August 12, 2014 Author Share Posted August 12, 2014 The carb has been rebuilt. Cleaned out and gone through once I got it. As for the turbo it is a draw through and pretty basic. I was told it's an old kit made by a company called cartech. Most of the info I've gotten on it is all over the place and hasn't been clear. All I know when looking at it it will work for some lower boost settings but has the ability to go more. The external wastegate for it I can recognize was built by turbonetics but the turbo itself the plate on it doesn't really tell me anything. I know the info isn't much and pretty scattered but it's where I'm at also. Quote Link to comment Share on other sites More sharing options...
Tony D Posted August 12, 2014 Share Posted August 12, 2014 Draw-through is what needed to be stated. Run a "T" on the fuel feed to the carb, and attach the return line to the feed, using a 2mm orifice (or needle valve) to trim for 3.5 psi at idle....and that will get you going. I prefer backpressure regulators, rather than upstream restriction. Summit or Jegs has a basketfull of them. Quote Link to comment Share on other sites More sharing options...
gorillaman2012 Posted August 12, 2014 Author Share Posted August 12, 2014 Fan freakin tastic. I've been trying to get a straight answer like this all week. Thanks bud! Quote Link to comment Share on other sites More sharing options...
Tony D Posted August 12, 2014 Share Posted August 12, 2014 You can play around with Holley jets stuffed in the return line to get the pressure you want just to get it running. Ideally one of those fancy regulators connected to,your vacuum source on the manifold can be used. It nice to snap-throttle closed, and the fuel pressure drops quickly--helps prevent high rpm drop-throttle sinking of the floats. I digress... Quote Link to comment Share on other sites More sharing options...
gorillaman2012 Posted August 12, 2014 Author Share Posted August 12, 2014 Alright cool. I've kept seeing though most manufacturers for regulators say not to use with a mechanical pump. Worries? Quote Link to comment Share on other sites More sharing options...
12doplumbing Posted April 3, 2015 Share Posted April 3, 2015 Ohh shit; I don't know my arse from an inlet... Tony D.: I've got another thread on this fuel pump and regulator issue and I'm not getting feedback. We have an '83 Turbo going in our '72 and we just hung the fuel cell which is being used as our primary tank. My question(s) is: I want an in-line pump recommendation and now I want to know where I put a regulator and regulate to what pressure? Can you help? I've got new 3/8 rigid fuel line to engine compartment and 8an tubing at the cell where if like to plumb the pump, filters and regulator. Can you help me clear up pressures and fixture locations? We'll be fabricating a chase/cover for these items around new filler neck, breather, and Fatts Rollover tubing - maybe I can squeeze the pump and regulated under it as well. Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted April 3, 2015 Share Posted April 3, 2015 Use a holley carb regulator. Keep pressure around 6 psi. You want the float level about 1/8" below the plug while running. Heat from the exhaust can also cause percolation so try to keep the carb as cool as possible. Quote Link to comment Share on other sites More sharing options...
12doplumbing Posted April 3, 2015 Share Posted April 3, 2015 Uhh, 6psi? Fuel injection turbo... Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted April 3, 2015 Share Posted April 3, 2015 Uhh, 6psi? Fuel injection turbo... You've jumped in on a carbureted draw-through turbo discussion. If you've got something different, I would suggest starting your own thread beginning with your specific setup. Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted April 3, 2015 Share Posted April 3, 2015 Oh I see, draw through turbo. I missed that. Quote Link to comment Share on other sites More sharing options...
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