Fuel Delivery Problem

[ScottJeep]

Background.. got the new "project" running recently. 1989 model 4.0L auto 2WD 75K on clock had been sitting for god only knows.  

Lots of neglect. Lots of parts missing.

 

Was having issues with it not wanting to change gears. Got cheap TPS replacement and also remembered the TV cable adjustment.

Seemed to be changing gears but was running much rougher. 

 

Figured I bump/broke one of my new vacuum hoses. Had replaced the main ones with NAPA parts.

 

Was worried I had just maybe run it too low on gas after checking everything over so.....ran to gas station bought ~7 gallons and put in the tank.   Tank has been previously cleaned out. And the pump seemed to have been working great. JY replacement BOSCH pump that looked brand new. 

 

Over 1/4 showing on the gauge now.  Pretty much bottomed out before. Ran for ~ 5 mins. 

 

Died as I was looking over ballast resistor  and EGR relay/solenoid.  

 

Would not restart. Notice when I turned ignition key to RUN position I no longer heard the fuel pump prime. Immediately worried. 

 

Pulled fuel line from pressure regulator. No fuel dribbled out. Turned key to RUN. No prime noise. No fuel. Turned to START, no fuel. 

 

Have checked everything I can think of. Have already been thru most of Cruiser's steps Swapped relays ( have many ). Cleaned more connections. Checked ballast resistor connections., EGR solenoid ( mainly cause I was touching it when it died), cleaned relay connections again.  Bypassed ballast resistor.  Bypassed Fuel Pump relay ( 30 -87 ) could hear click from driver's side but not sure from what. 

 

Will start and run when I soak the air filter a flammable liquid. 

 

Just weird but yeah I know...I own three others and have owned four in the past.  

 

Have I overlooked the obvious or is it time to pull the pump and consider myself lucky that my $15 complete JY fuel pump lasted this long?

 

[shelbyluvv]

Check the ground behind the drivers side tail light. Clean and regound. If that doesn't work pull the pump and hook it up to the battery and see if it powers up.

[ScottJeep]

Ground in driver's side tail-light good...done as part of Cruiser's ground refresh.  

 

Did go ahead and pull the pump. Worked fine with 9V battery.  

 

The horrible pump in It when purchased was ran with a fused wire.  Removed it when I got the pump installed and everything worked.  

 

With so much in question under the dash I am in the process of hooking it back up with a fused line off the ignition again.  

 

Not how I really want it but need to work thru other issues with it and not running makes things more difficult than a directly wired fused fuel pump. 

[yxmj]

you do not need to pull he pump to test it.....run a known good +ve and -ve (12v) with some jumper wires and test it that way first (while still in the truck)   . :MJ 1: .

[ScottJeep]

Well after a fun day of pulling everything back out.....it runs now....but back to an old problem and a new one.....

 

Old Problem:  Leaking at the Fuel Pressure Regulator..... I so HATE that little o-ring and it's job performance.

 

New Problem: When you turn the ignition off the truck keeps running! Never had that one. Disconnect the hot wire

for the fuel pump to kill the truck.  

 

Bad Ignition Switch all along ???

 

 

The wired I used was the one that was there from before. Figured sooner or later I'd need a hot feed off the ignition

for something.