Sounds to me like a bend/kink in your filler neck, or someone stuffed a rag down there.
Remove the fuel filler cap and run a long, rigid wire down your filler neck - if you encounter significant resistance, remove the filler neck from the tank and investigate further.
SOURCE: cadillac wont start
You have gotten Air into the Fuel line. You really need to let it run for a while and let it work the air out. When it Dies just keep trying to start and you will get the air out.
SOURCE: water coming from engine into overflow tank
Sounds like an overheating problem, best to get it checked, maybe thermostat stuck closed, pluged radiator, head gasget, cracked head.
SOURCE: 97 cadillac eldorado overflowing through overflow pipe
The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank(not the cap),this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.The hose goes in to the engine to a crossover and comes out the other side to near the thermostat housing,the blockage may be there.
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