Hello all,.
I have an M6 5.7 LS1 in an Australian car (late 70's). The engine is standard internally with new plugs, leads and injectors. The intake is the factory intake pipe, MAF and aftermarket pod filter.
The fuel system is a Aeromotive in tank Phantom setup running a Covette filter regulator. A mechanical gauge on the fuel rail shows a steady 55ish psi at idle/revving. The fuel tank has breathers attached and is vented through a vapour seperator (1 x breather from the Aeroflow setup, 2 x from the original tank)
The tune in the car hasnt had much done to it (idle speeds, fan speeds, a little VE table adjustment etc)
The issue im having is that the car seems to be running out of fuel after running for 10-15minutes. It has repeated this issue 3 out of the last 5 short test drives performed. A re-routing of the fuel tank breathers took place before the last issue to ensure the best possible chance for tank breathing is taking place.
Symptoms: Car runs fine, idles fine, drives around fine for a good 10 mins or so. Then it feels like it has run out of fuel (struggles to keep running, surges, needs heavy throttle input etc) Pulling over and stopping/re-starting seems to clear the issue. The log file attached shows it idling fine after struggling for just over 1 minute (12.5 mins into the log)
The 02 sensors show an extreme lean condition when the issue occurs (02 sensor voltages < 60mV)
My question is: Is there something in the log or tune file that I am missing? Does the data suggest a tune/ECU issue or should i be looking at a mechanical issue?
Thanks in advance