emeraldlion Posted July 9, 2010 Share Posted July 9, 2010 Now I know the stock pump is pumping fuel injection type psi, but what I was unsure of is do I need to swap to a noisy aftermarket carb fuel pump or can I keep my nice quiet stock pump and use a quality regulator and return line setup. I think I saw a couple of regulators that ranged 3-60 psi, they weren't cheap but they were available. Quote Link to comment Share on other sites More sharing options...
GOTHALOSISM Posted July 9, 2010 Share Posted July 9, 2010 Holley makes a good electric pump for carb setups. It goes in the stock location on your Z. Quote Link to comment Share on other sites More sharing options...
emeraldlion Posted July 9, 2010 Author Share Posted July 9, 2010 Yeah my last z had a holley red. Was noisy as heck though. Wanted to know if it's okay to run the adjustable regulator thatstates 3-60 and adjust it appropriately at 5 or so psi or if this causes to much back pressure in the line Quote Link to comment Share on other sites More sharing options...
GOTHALOSISM Posted July 9, 2010 Share Posted July 9, 2010 I'm not really sure, but to be safe it would be best to use a low pressure pump. Last thing you want is to blow out the seals and the needle. Quote Link to comment Share on other sites More sharing options...
emeraldlion Posted July 10, 2010 Author Share Posted July 10, 2010 Bollocks, exactly what I was trying to convince myself wasn't necessary. Quote Link to comment Share on other sites More sharing options...
Pyro Posted July 14, 2010 Share Posted July 14, 2010 (edited) nothing wrong with using the stock efi pump for a carb. just get a return style fuel pressure regulator that can go down to carb pressure aeromotive makes one that will work for 120.00. check it out at www.summitracing.com Edited July 14, 2010 by Pyro Quote Link to comment Share on other sites More sharing options...
emeraldlion Posted July 14, 2010 Author Share Posted July 14, 2010 that's the advice I was looking for. I saw the aeromotive unit just wasn't sure/ Quote Link to comment Share on other sites More sharing options...
Pyro Posted July 19, 2010 Share Posted July 19, 2010 that's the advice I was looking for. I saw the aeromotive unit just wasn't sure/ I helped a friend on mine do exactly that; supply a carb'd 350 sbc with a stock efi pump (msd 2225 efi pump). has a 77 280. He went from an efi turbo setup to a chevy 350 with a Q-jet. we just regulated the pressure down to 5 psi with the aeromotive fpr (return style) and no problems for 2 or 3 years now. And the car is a major daily driver (250+ miles/week) Quote Link to comment Share on other sites More sharing options...
emeraldlion Posted July 19, 2010 Author Share Posted July 19, 2010 Did you run a larger return line than stock? I was expecting a reduced life on the pump because of the built up pressure between pump and regulator if return line wasn't large enough. I may start this way and just replace the pump with a proper carb pump if it craps out. Quote Link to comment Share on other sites More sharing options...
Pyro Posted July 19, 2010 Share Posted July 19, 2010 I feel the pump will last longer due to less pressure on the pump. the return is the same size as the feed line and it flows very well. I did a test a few years ago. just looped the fuel directly back to the tank with no fpr. Just a Tee at the point the feed line returned back to the tank (by the filter) and measured the pressure at the tee. measured between 1/2 and 1 psi at the tee, which means the stock return line is more than big enough to reduce the pressure. furthermore, efi pumps lose fuel volume with more pressure. So, at 5 psi, the stock efi pump will flow lots of fuel, much more than at 30 psi. and there isn't any "built up pressure between the pump and regulator" . The built up pressure is only equal to the pressure at the regulator due to the return line. Quote Link to comment Share on other sites More sharing options...
emeraldlion Posted July 19, 2010 Author Share Posted July 19, 2010 Thanks for the lesson. I love learning stuff on this forum. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.