I just put in a 355 in place of the 305 TBI.
I have a mechanical fuel pump on my 355.
Isn't there a fuel pump in the gas tank? Will this screw up anything or should I even worry about it.
Hopefully I'm not blowing any smoke on this one..

Thanks!

 

Just pull the fuse for the fuel pump

 

You have to pull the pump out of the tank if your not going to use it. The mechanical pump cant pull gas through the pump in the tank if its not working. You have to pull the pump and run a line in its place so your mechanical pump can get gas.

 

I don't believe so. Double check.

JamesC

 

On an '82? No I dont think so. Only the mechanical pump IIRC.

 

Crossfire?

 

What's the verdict?
As it is, I'm driving it already.
If I do have to pull the pump, in the tank, what do I put in place of it? Is there a plug cap with vent/feed tubes coming off of it or ?????
This is an 1982 Z28 that had the 305 TBI in it at one time.
The ECM is still attached to the wiring harness, but the previous owner had cut all the wires from the ECM, going into the engine compartment.
I don't know if that helps!

 

If the car had a fuel injected engine in it before than it should have a pump in the tank I thought. But if you are already driving the car than you either dont have one in the tank or you may not need to pull it. In my 89 I did an engine swap and went to a mechanical pump but I couldnt get any gas at all till I removed the pump from the tank.

 

In 1982, electronic fuel injection was in a dual throttle body, cross configuration, commonly called "crossfire". When you say "TBI", people think of the 1988 to 1992 system, which had a single throttle body on it. Just to clarify why what you're saying is confusing people.

If the ECM wires have been cut, your in-tank pump isn't working. It is possible for a mechanical pump to pull fuel through it, but it isn't possible for it to do it efficiently. Your best bet is to drop the tank, pull the pick-up/sender unit, remove the electric pump, and put rubber fuel hose in its place (make sure you keep the strainer). Or, you can run your own wiring to the pump, routed from switched ignition power and through an oil pressure switch, with a return-style regulator between the mechanical pump and the carb.