Hello, I'd have to check actual voltage reading voltage at the fuel pump, when the problem occurs. Can you test the voltage circuits at the fuel pump relay? There shows to be an oil pressure switch in the fuel pump circuit, parallel to the relay. An extended crank may mean the pump is getting voltage from the o/p switch not the relay. The extended crank because the oil pressure has to build some before the switch will close.
There shows to be a fuel pump prime connector, it's a test connector for the pump, you can run the pump without using the key. Looking under the hood, a little left of center on the firewall, gray wire with electrical connector, nothing plugged into it. If you use a jumper wire and run B+ to the connector, the pump should run, use an inline fuse.
All the pump manufacturers you mentioned have web sites, they will talk to you about their pumps. I have talked to airtex before, haven't talked to Delphi.
Thursday, August 13th, 2009 AT 10:42 AM