1990 Southwind motorhome won't keep running
we have a 454 Chev engine, with TBI. It will start, but cut out and die within 1 min. maximun. We've sprayed starting fluid into the intake (TBI) and it died anyway (it made no difference). We also ...
Forum Discussion
MountainAir05 wrote:
Sounds like fuel. If memory serves me power is sent to the fuel pump for a 20 seconds or so, then after engine starts the oil pressure switch ensures you have power to fuel pump after you engine starts. You can check to see if your pump is working after startup. You can hook up a fuel pressure gage and see if pressure drops. Also a timing light will show spark.
I believe the pump stays on from seeing voltage from the alternator on this model.
Here's what is happening, when you turn the key on the pump automatically turns on for a few seconds to bring the fuel system up to pressure. This is your initial start.
After start, the alternator current flips the pump relay and keeps the pressure up. This is what is not happening and is probably caused from a problem with the pump shutoff system. You can jump the relay temporarily and the motor will run. They set it up like this so that if for some reason the motor stops the pump won't continuously run.
When you had it jumped from another truck it saw voltage from that alternator keeping it on...
