Truck won't Run

[huck731]

so I replaced the fuel pump and filter, along with making sure all the lines are not blocked.  now the truck will run for roughly 30 seconds and then sputters out, if I try to give it a little gas it chokes out, but if I squirt some gas directly into the throttle body it will smooth out for a second or two.  I am completely baffled by this issue and I need my truck back on the road asap.

 

btw, it is a 91 2.5l

[Geonovast]

Have you checked the pressure?  How do the plugs look?

[huck731]

FIXED. turns out it was the ballast resistor on the drivers fender.  mechanic said it is very common on older chrysler motors and most people just carry a spare in the glove box.

[jimoshel]

I think more people just bypassed it than carry a spare.

[cruiser54]

I think more people just bypassed it than carry a spare.

Yep. Only there to reduce fuel pump noise.

[ftpiercecracker1]

 

I think more people just bypassed it than carry a spare.

Yep. Only there to reduce fuel pump noise.

 

 

I was thinking about this and had a thought  ( :idea:)  The resistors purpose is to regulate the volts to the pump based on the demand for fuel by the engine.  Thus leading me to believe that removing it might cause the premature failure of the pump. Without the resistor the pump would be running full tilt at all times instead of only when needed.  I would not be surprised if i am way off base, but just don't understand why they would put something on simply to make the pump 'quieter. :dunno: '

 

My 2 cents.    ;)

[cruiser54]

 

 

I think more people just bypassed it than carry a spare.

Yep. Only there to reduce fuel pump noise.

 

 

I was thinking about this and had a thought  ( :idea:)  The resistors purpose is to regulate the volts to the pump based on the demand for fuel by the engine.  Thus leading me to believe that removing it might cause the premature failure of the pump. Without the resistor the pump would be running full tilt at all times instead of only when needed.  I would not be surprised if i am way off base, but just don't understand why they would put something on simply to make the pump 'quieter. :dunno: '

 

My 2 cents.    ;)

Was designed to run full tilt. No problems. They did it because customers whined about the "hissing" noise from the gas tank.

 

[ftpiercecracker1]

 

Was designed to run full tilt. No problems. They did it because customers whined about the "hissing" noise from the gas tank.

 

 

 

 

Like i said, what the hell do i know   :rotf:        Although i am suprised to hear, does that mean there are some MJ that came without the resistor?

[cruiser54]

 

 

Was designed to run full tilt. No problems. They did it because customers whined about the "hissing" noise from the gas tank.

Way more noticeable on the XJs as far as noise. In 87 they came out with a TSB and retrofit kit with the resistor. Became factory equipment through about 96.

 

 

 

 

Like i said, what the hell do i know   :rotf:        Although i am suprised to hear, does that mean there are some MJ that came without the resistor?

[jimoshel]

Not sure but I believe the '90,91 and '92 were sans the resistor.

[HOrnbrod]

1993 when they replaced the fuel pump. I'm keeping my ballast resistor.

 

http://dodgeram.info/tsb/1993/14-14-93b.htm

[87manche1]

.9 hrs to replace a fuel pump dam dealers mechanics be getting screwed

[Dadinator]

My 90 had one.  Removed.

[huck731]

I thought about finding a way to hard wire it, but I have yet to do so as it has 2 hot wires going into it and no wires feeding out.