Ok first a related funny story. Back in the day I worked in a Ford/Lincoln service dept. A turbo Tbird had an intermittent stalling issue. Don our excellent lead tech checked everything related and determined that even though the fuel pump was running (submersed in tank) it was losing fuel pressure. The required removal of the tank ensued and upon removal of the pump there appeared to be a plastic bag floating around in the tank. An expertly configured coat hanger removed the offending object and with that it became even more offensive. The object was a condom that had swelled to about 15 inches long and 6 inches wide (reservoir tip and all). Don displayed the trophy of his superior diagnostic and repair abilities on the wall above his bench for months to come. Many conjured stories were spun by the techs as to its sordid history.
Now my tale of woe. My SLC has a LS3 376/480. My fuel system is as follows: tank to 100 micron filter to Holley 125 low pressure pump to swirl tank. High pressure Bosch 200 (replacement for their 044) out of the bottom of the swirl tank to 10 micron filter to pressure regulator to rail. The pumps are mounted low with minimum lift required. What happens is after about 40 to 45 minutes of driving it appears to lose fuel pressure. I checked the tank vent (from tanks Inc) and its clear, when I open the fuel tank cap there doesn't appear to be any vacuum when the condition happens. If I sit 10 minutes the car will run ok. The condition seems to happen when I am in the throttle aggressively. The high pressure pump seems to be laboring. I have replaced the fuel filters and the high pressure pump (the original Bosch 044- verified OEM was screaming). My thoughts are either the Holley 125 pump failing and the swirl tank runs dry (seems unlikely) or an intermittent restriction in the swirl tank ( Hmmmm maybe a condom! ) like weld slag etc. Any Ideas? I'll be taking it apart this weekend.
Now my tale of woe. My SLC has a LS3 376/480. My fuel system is as follows: tank to 100 micron filter to Holley 125 low pressure pump to swirl tank. High pressure Bosch 200 (replacement for their 044) out of the bottom of the swirl tank to 10 micron filter to pressure regulator to rail. The pumps are mounted low with minimum lift required. What happens is after about 40 to 45 minutes of driving it appears to lose fuel pressure. I checked the tank vent (from tanks Inc) and its clear, when I open the fuel tank cap there doesn't appear to be any vacuum when the condition happens. If I sit 10 minutes the car will run ok. The condition seems to happen when I am in the throttle aggressively. The high pressure pump seems to be laboring. I have replaced the fuel filters and the high pressure pump (the original Bosch 044- verified OEM was screaming). My thoughts are either the Holley 125 pump failing and the swirl tank runs dry (seems unlikely) or an intermittent restriction in the swirl tank ( Hmmmm maybe a condom! ) like weld slag etc. Any Ideas? I'll be taking it apart this weekend.