[cmk-2]

I have the same problem with my stock 1978 L-78. I had the carb rebuilt but still have the same kind of dead spot. Would a bad/weak fuel pump be the problem? Thanks for any help, Robin Bailer

[Bill Boyle]

CMK-2
I have found the stock fuel pump provides adequate fuel to a q-jet in most street 400 applications. Even my 406 with all it's current power building mods can handle it. The q-jet is probably in need of work. The system, and I'm no expert, runs off an idle system and then graduates to the main metering. That first "pop" when you hit the pedal hard should provide a sizeable spurt of fuel from the primaries so there is no "dead" spot. IMO if your fuel pump is not providing adequate fuel, there would be loss of power at high rpm, just before a gear change, a loss of power like a nose dive. You may want to double check your gasoline filter. If in doubt, get a new one. The other thing is the location of the accelerator pump arm. It should be in the inner hole position to get the biggest spurt of gas.

I hope this helps.

[cmk-2]

Thanks Bill,
I was thinking fuel filter as I was writing my question. I'll go a head and change it. Robin