My Bronco has been running funny ever since I put a gas tank in it from the junk yard. When pulling off the old tank, the large quick connect adapter broke off. We "frankenstiened" another smaller adapter we had by drilling it out with a 3/8" bit. Doing this broke off part of a rubber seal and caused it to block the flow of the gas through the part.

Yesterday I took the gas tank down and tried to install another adapter on there, but it didn't work. I thought about using the "frankenstiened" part, but decided to go a route I thought was more safe. I took some 5/16" I.D. tubing and connected it to the stock fuel line with a 5/16" adapter. I connected the other end of the tube directly to the line on the fuel pump and put hose clamps on each end. Its still not working right.

Here's what it is doing: I turn the key to start the truck, but it usually does not work on the first try... seems like its not getting gas, or no spark. When it does finally start it tries to stall on me, so I hit the gas alittle and it will either try and stall again after I let off or it will idle fine. On the road the truck will run fine for a few minutes then it starts to die, I have to keep pumping the gas pedal all the way to the floor so that I can keep my speed for a short while, then the truck starts slowing down no matter how fast I pump the gas.

Note: The truck was running fine until I put in the used gas tank and fuel pump. There was some gas in the tank, but very little sediment inside of it. I changed out the fuel filter last week. I have changed out everything but the fuel pump and the fuel lines, so I'm thinking its probably the pump.

Any ideas or suggestions?

 

Come on guys, I need some help with this one.

 

have you tried running any cleaners through the fuel system? maybe your injectors are gummed up from the nasty old gas.

recently i had a similar problem with my truck starting after i swapped in a new pump for the n2o install... check valve on the pump assembly was damaged and caused the truck to not turn over on the first try only... i'm not sure if thats even a possibility with you as im not familiar with your pump assembly... but just a thought ;o)

 

Thanks for responding. I was actually thinking of going the same route, putting in some injector cleaner but now there is another problem.
This may have been a coincidence that it happened the same time I put in the new/used tank and pump. I tried turning over the truck yesterday and it wouldn't go the first two times. On the tird time, the whole truck just went dead. And I mean everything went dead. I took out my voltage tester and I'm getting nothing on the inside of the truck. On the outside, I took it to the battery and I'm reading around 12.5v. When I took it accross the cables coming off of the battery, It only read 5v. Could this be the reason it was trying to die on me, not enough voltage coming off of the cables? And how could I have this problem with the voltage drop?

 

honstily i sayed it before...replace it and the fuel filter...

 

wow thats WIERD. so youre saying that the voltmeter reads 12.5 at the positive battery terminal, but if you take a reading off any positive wire coming off the positive terminal, it only reads 5v?

 

Sounds like it's a bad ground to me... That is the only thing that will cause weird voltages at points that are supposed to be the same potential. Check your positive wires, and make sure that the insulation is alright, and that it's not grounding out on metal somewhere, maybe at the firewall? Then check the ground wires, and make sure that they're still SECURELY fastened to the chassis. The tank also has a ground usually, maybe check that since you've messed with it recently.

As far as low voltages, that will DEFINITELY make the truck try and die/run poorly. When my alt. went on my '90 bronco, that's what happened, first no radio, then poor idle/no power, then just died. When I replaced the alt. and charged the battery, everything was fine.

Don

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Sorry Zach, that's not the problem. I changed it out last week... read my post, right now I'm wondering if it had anything to do with the fuel pump.

 

Thanks Don, I'll be checking up on my wiring when I find the time. Just for the info, my gas tank, nor any of the others that were at the junkyard (all around 1985-1987) were grounded out.

 

Exact same symptoms when my 01's alt. went out. Replaced it and she was good as new, so I would guess it's an electrical problem also. Go over all your wiring and make sure you've got good grounds where you need them and none where you don't.