I am using a Walbro pump which is keeping my vegietherm in the green with a cycle every few seconds. I run for about 10 minutes and the 6.2 gives up. It takes about 10 seconds or so to restart on diesel. I've bypassed all the stock fuel lines and am supplying veg to the injector pump just after the stock fuel filter on the firewall. This is a 1985 6.2L Suburban. The fuel pump seems to be delivering quite a bit of fuel per minute. The system is looped. In stock unlooped mode it stalls very quickly. My Mercedes single tank is much more driveable on the same fuel. I just can't quite get my Suburban going. Peugeot tank under vehicle to a Vormax to a Fram 5 micron filter to a Walbro selfregulating pump to a 6 port valve to a vegietherm then to the injector pump. My system completely bypasses most of the stock fuel supply system. Do I need more than 6psi into a 6.2 GM diesel? Lawrence Rhodes.........