madden87 Posted July 18, 2008 Share Posted July 18, 2008 I start at 6psi, but when I get home and check the pressure it is at 1psi. I have a summit 140gph fuel pump located near the fuel tank even with the bottom and a holley dead head regulator. I will be switching it out to a by-pass style, but I don't think the pressure should be this drastic. My first thought was vapor-lock so I switched to steel braided line and moved it to the outside of the frame rail and away from the exhaust. I routed it away from the headers (which are wrapped) but the pressure still drops after I drive for a while. Any ideas??? Quote Link to comment Share on other sites More sharing options...
gwnwar Posted July 18, 2008 Share Posted July 18, 2008 Is your fuel tank vented and is it working..have you tryed running with the filler cap off.. Quote Link to comment Share on other sites More sharing options...
madden87 Posted July 18, 2008 Author Share Posted July 18, 2008 I still have to drop the tank to remove one of the bumper supports. At that time I am going to vent the tank from the top, but for now I drilled 2 holes in my gas cap. I will try removing the cap to see if that makes a difference. thanks Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted July 18, 2008 Share Posted July 18, 2008 some electric fuel pumps quickly heat up and loose effective pressure if the regulator won,t allow a constant flow of fuel thru them to absorb and carry away heat, thats one of the many reasons a bye-pass regulator with a decent size fuel line from and returning too the tank is a superior design. dead head regulators just don,t generally work very effectively anyway, and you need to use the correct fuel line and filter, a 7/16"-1/2" inside dia. will supply most HIGH performance SBC engines, you can get by in many cases with dual 3/8" inside dia lines for a mild upgrade but the common 5/16" lines almost always pose a restriction read http://www.centuryperformance.com/fuelish-tendencies-understanding-fuel-pressure-and-volume-spg-140.html Quote Link to comment Share on other sites More sharing options...
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