I have Enderle hat on 760 HP SBC I had been making changes to try to get it to footbrake with little success. Now car has developed a bad problem and will not come up on converter. The data logger is showing fuel pump pressure drops like a rock, all O2 sensors read lean and car just lays over.
My first thought was loose fuel line and dirty filters causing pump to suck air and not fuel. Drained fuel cell, checked and cleaned filters and checked all fittings (they were tight). Fuel filters had a few little bit of trash but it was not much and filter was not clogged. Nothing more than I consider normal.
I checked the belt and the pulleys are good. The nozzles are clean and flowing and all O2 on all 8 cylinders are consistent so it is not a clogged nozzle.
I looked in the fuel cell for paper or plastic or anything that could float around and block outlet. Nothing, yet it sounds to me like it is a fuel supply problem. Car has been running very good with same system for several years. I do see a few things I could improve to make system better but it was working good before and I need to fix the issue here. Most of the hoses are one year old and in good shape.
I will probably put my old tune up back in it and I have a new pump that I may try but I seriously doubt that is the issue. It is acting like it is starving for fuel and sucking air. Note I am not that far off of old tune up now and it should be way fatter. Basically I am right now one size smaller nozzles and way smaller main so it should if anything be very fat right now but it is not and in my opinion it is somehow running out of fuel.
I have two large Summit stainless filter elements that go into a tee fitting and one -10 line to bottom of pump. No sharp turns or anything like that. Returns go into top of cell near the back. I am thinking of making a manifold to return the fuel back into inlet line near pump to reduce aeration of fuel. I think it would also help to keep inlet fuel flowing and pump covered with fuel. Now I found two larger filters and will probably get them and put them on, anything I can do to increase flow and lower restriction should help but the current filters are not the problem as they have been working well and were clean.
It is not ignition as logger is not showing any missing etc.
Any suggestions? Hope I gave you enough information to give me a direction to look. Thanks,