under hood fuse box.
The fuel pump relay on a 92 gmc 1500 is located on the passenger side of the firewall behind a black plastic cover.
Its on the firewall on the left side above the motor. If there are two relays there, the fuel pump relay should be the one on the left.
The 2014 GMC Sierra-1500 runs on flex-fuel (FFV).
gmc 1500 sierra was fuel injected in '92
Fuel injection
The 2004 GMC Sierra-1500 runs on regular unleaded.
The 2001 GMC Sierra-1500 runs on regular unleaded.
The 2008 GMC Sierra-1500 runs on regular unleaded.
The 2002 GMC Sierra-1500 runs on regular unleaded.
The 2010 GMC Sierra-1500 runs on regular unleaded.
The 2006 GMC Sierra-1500 runs on regular unleaded.
The 2013 GMC Sierra-1500 runs on regular unleaded.