Electric Fuel Pump Issue, NOT pump
Hi this is my first post, I have read almost all the posts on this site and hope someone can help me out.
I have a 1995 YJ with a 2.5 liter 5 speed.
I replaced the fuel pump last weekend because it was not pumping fuel when the engine had sat for about 15 min or more. If i turn the key on and let it sit for a while, or turn it on and off for a while and try to start it, I get a growling sound under the hood that last for about 10 to 30 seconds. As soon as the growling sound stops the fuel pump kicks in for about 3 seconds and the jeep will start right up and run fine until I shut it off and let it sit again for 15 minutes or so. I have started it and shut it off then immediatley turned the key back on and sure enough the fuel pump will come on for 3 seconds and the Jeep will start right up.
I was lucky enough to track down the clicking/growling sound to the auto shutdown relay and replaced it. Still doesn't work, and still makes the same noise for 10 to 30 seconds then the pump kicks in and you know the rest.
Anyone got any ideas? It seems to me that there is a circuit that works when the engine is running but doesn't when I try to start it. I know with some older GM vehicles the fuel pump has a backup circuit that works when the oil pressure is over 5 PSI, but while cranking the engine it pumps up to about halfway so if it had the same circuit it would pump.