Dodge Repair Questions? Ask a Mechanic for Answers ASAP
if you spray carb cleaner in the throttle body does the truck start or try and start?
1990 ramchargers should have a fuel injected engine NOT a carburated one are you sure you have a carburated engine?
are you sure you have the pump wired correctly?
if you have the wires reversed the pump will run backwards and never pump fuel, try reversing the wires on the pump and see what happens
who says the pump is wired correctly from bosch, while a well known brand they do have quality control issues, you also said there was an aftermarket pump installed i assume someone split the wiring at one time and it needed repair was it repaired correctly?
remember a DC motor will spin in reverse if wired in reverse, if you hear the pump run and NO fuel is coming from the line then either it is wired backward or installed incorrectly and feeding fuel back to the tank instead of from the tank
what is the part number of the pump you installed?
that's a universal style pump, be sure your wires are correct a fast check is simply reverse your wires and see waht happens BEFORE you drop the tank again,
there could be a leak at the line that goes from the pump to the hanger or you could have the feed and return line reversed as well, back then we used 2 lines on ALL injected vehicles, also that pump will need a regulator to reduce it's pressure to something the carb can handle
you have 2 feed wires on the pump right?
1 is power to the pump the other is ground for the pump the other 2 would be for the sending unit swap the power and ground for the pump feed, use your test light to see which is power and which is ground, if you ran new wires you should know which is power and which is ground the power will be from the fuel pump relay and the ground needs to be attached to the chassis.
simply SWAP your power and ground wires.
unfortunately your truck is too old for me to pull factory wiring diagram for the fuel pump circuit