We took a 4.3 out of a 92 s10 and put it in a 1991 s10 we changed the motor ,wiring harness under hood, tranny ,rearend fuel tank and lines ,and the comp behind glove box now everything works except the injectors im not getting any power to them
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sometimes if a fuel pressure regulator goes bad , you will be able to smell fuel fumes under hood. a leaking pressure regulator will cause---hard starting, poor fuel economy, stalling, check engine light, gas smell under hood. also check all fuel lines under hood.
On your Festiva, if you have an automatic transmission the fuel pump is inside the fuel tank. If you have a manual transmission, the fuel pump in to the left of the carburetor on the top back side of the engine (and is a manual pump operated off of the engine cam). Depending upon which you have, you will want to obtain the correct one. You can disconnect the fuel line from the place it enters the carb or injector system and also at the tank and blow through it to make sure there are no obstructions. I'm sure you have checked that the fuel filters are not clogged? The auto tranny model has 2 filters (one in the tank and one under the hood), while the manual tranny model has just one under the hood. Remove it and blow through it too to make sure its clear. Through the process of elimination you can either find the blockage or simply replace the appropriate fuel pump. The correct fuel pressure should be 33.6 psi on the Festiva, so if you get it pumping a little, you should make sure that the pressure is adequate, because if its not, you will still need to replace the fuel pump anyways.
my guess is there is a fuel pump in tank as there are in 95% of diesel motor vehicles. you may have just sucked out the existing fuel from the lines. the fuel pump can withstand high amounts of amperage and voltage so by hooking up wires wrong i dont think you burned up the pump but you may have wired it up wrongly, or you have forgot to put the o rings back inthe housing properly. or drop on in tank. check the fel system setup. Orings in place, wiring connected properly. if all else fails give the pump a hit and see if it will start.
before you try taking your tank down take your seats out remove your mats look on the floor area for a small opening in the floor mat open it I believe that hole will show the fuel pump on your tank check fuel pump relay under the hood then check your wireing harness at the fuel before attempting to remove the fuel pump
The plastic line in the wiring harness goes to the heater controls; and believe it or not , the other end goes to the vacuum tank - but its in the FENDER !!!!! behind the ABS, kinda under the drivers side hood hinge - great place to put one ain't it ? No wonder GM is going broke !! Good Luck