no fuel on start up

GA_googleFillSlot("Forums_ROS_300x250_noad");Hi all new to forum.

I have a 89 S10 4.3 tbi 4x4 truck
I got the fuel pump for 2 sec when I turn key to on
but when motor is cold I need to pump the gas to get the injectors to pump fuel?
but when its warm it fires right off?
It all started when I changed my heater core and themostat.
I loosend my dash and pulled it out a bit on the passenger side.
I have replaced:
fuel pump relay
ignition module

Is there a ground strap I may have off in the dash area? Is there a ground strap for the ecm?
It runs great once started. it goes down the road fine even freeway no fuel starvation

Check the thermostat bolt grounds and the tempt sending unit to computer and also the air intake sensor for being plugged up.

Every thing was fine untill the heater core tho. I have ran another ground on the wires that go to the stud.... No change
Could I have plulled off a ground wire by the heater core? or is there any there?
The only wires I unplugged were the two ecm and that 1 plug that hooks into that white thing that attaches to the ecm bracket

It will start to pump if I pump the throttle to the floor?

I just tested again and it is a code 54 fuel pump relay. It has had this code from the time it has started this problem?

Check for and check all ground wires on stat housing?
Will code clear and come back or not come back?

Does fuel pump run on engine cranking?
How is the fuel pressure?