The fact that the truck runs but no accelerator pump shot to me means that the either the accelerator pump seal has failed or the check valve for the accelerator pump is stuck.
My money would be on the pump seal failing. It is quite possible that the seal's lip stuck to the pump bore when the fuel evaporated and then when the pump was operated it tore the lip and now it won't seal. Or the seal is stuck to the bore and the whole cup has pulled off of the accelerator pump shaft.
This link may help explain what I believe your problem is.
http://www.v8buick.com/index.php?thr...-issue.263146/
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread
http://67-72chevytrucks.com/vboard/s...d.php?t=698377