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93 gmc topkick runs fine lose power to point of stopping restart it runs for min maybe or may be fine till get where you are going may restart 20 times some days nothing happens done all the tune up stuff change fuel pump had one from other truck so wasn't a new pump but same thing happinv
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Just asking but if you have a new water pump or gasket it should show how many there is. If not go to an auto parts store site and look a water pump . AutoZone has very good pics at all directions.
Before going there, check your INERTIA SWITCH (INTERTIAL CUTOFF SWITCH). A small accident or a sharp bump can cause the cutoff switch to trip. The switch is located adjacent to the passenger side rear shock tower, and there is a pushbutton to reset (on most Topkick tucks). Carbureted Topkick trucks do not have cutoff switches, and some custom trucks have the inertia switch relocated.
Electrical problem. Something gets hot and stops working. Could be fuel pump or something in the ignition system, so losing spark. After it stalls, spray starting fluid in the intake and try to start. If it fires up and runs a few seconds, you know it's a gas problem. If starting fluid doesn't do anything, check for spark, it's probably an ignition failure-possibly the coil or the ignition control module. The module can be tested at a parts store.
could be the pickup coil in the distributor they go bad fairly often
pickup coil resistance should be 500 to 1500 ohms between the two leads.also move vac advance plate ohms should not change.there should be infinite ohms [no continuety] between either of the leads and ground
the fuel pump could actually be malfunctioning. and the reason that you are able to restart and drive again is because when you turn the key on it is allowing the fuel pump to pressureize your system. but while the fuel pump is continuasly running it is loosing the fuel pressure. this is common on the cheap fuel pumps. i am not sure about were you got the fuel pump from but in all of my experiances with this problem i find that the fuel pumps have been boughten at a napa store.
i hope this helps you out.
and you could attach a fuel pressure gauge on to the fuel rail and start the car and watch the pressure to see if it is droping.
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