Chrysler Repair: 1994 plymouth sundance wont run, plymouth sundance, fuel pump relay

Question
I have a 1994 plymouth sundance 2.2 liter automatic sedan.   I don't hear my fuel pump humming when I turn on the key so I may have a fuel problem as my car will not start or it will start and run about 5 minutes and die.   I have checked the diagnostic codes by turning the key on and off and leaving it on the fifth time - I just get the 12 (for no codes) and the 55 for the end of the cycle.

I have had this problem before and switched out the gas tank since the fuel pump is in the tank (have to take the tank down anyway to get to the pump).    I have changed the auto. shutdown relay as that did appear in my codes a while back when the car was running and then just died for no reason.   If my problem was the fuel pump relay on the frame behind the battery, it seems I would get a code.   So I keep thinking I'll have to take the tank off and check the fuel pump -  unless my problem is a bad relay..... Any suggestions?

Answer
Hi Betty,
I would check the fuel pump and its wiring by removing the fuel pump relay (in-board, mounted on strut tower) and jumping from the front to the rear pin socket (red/white to dark green white wires) which replicates a 'closed' relay condition. That will tell you if the pump is OK or not. But if it doesn't run, then do verify that you have 12V on the front pin socket (red/white wire) and if not then you have a blown fusible link (white) because that comes from the battery.
If the pump is OK then check for spark.
If that is OK then check the egr valve which may be stuck ajar and is the most likely cause of a 'no start with no codes' when you do have spark and fuel. That egr can be fixed with WD-40 sprayed on the valve stem where it enters the valve body and then moving the stem back and forth with the tip of a screwdriver inserted in the circumferential slot of the stem. The egr is on the firewall side of the engine accessible from the passenger side where you will spot it quickly. It is mounted vertically and has a round vacuum-operated top piece, the body of the valve proper, and a flange in between inside of which you will see the stem/slot.
Roland
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