1990 fires up then dies - ZR-1 Net Registry Forums

Stan Masta · 03-20-2015

Fuel pump shuts off after 2 seconds. FP1 relay checks out. ECM Code 56 even after reset (coincidence?). Vacuum sensor checks out with 0.555 V at atmospheric. Any danger in forcing FP1 with jumper? Couple of times engine ran for a while with AG jumper in ALDL. Complete fuel pump setup replaced 2 years ago and worked great until recently. All ideas welcome.

03-20-2015	#1
Stan Masta Join Date: Dec 2005 Posts: 5	1990 fires up then dies Fuel pump shuts off after 2 seconds. FP1 relay checks out. ECM Code 56 even after reset (coincidence?). Vacuum sensor checks out with 0.555 V at atmospheric. Any danger in forcing FP1 with jumper? Couple of times engine ran for a while with AG jumper in ALDL. Complete fuel pump setup replaced 2 years ago and worked great until recently. All ideas welcome.