okay so i read the v6-v8 post above and have a few questions.


" 12. If the V6 is fuel injected and you are putting in a carbed V8, the fuel pressure will need to be lowered using a 3-port (with return) adjustable fuel pressure regulator. Or, drop the fuel tank and remove the in-tank electric fuel pump. If you keep the electric pump, be smart and use an oil pressure safety switch. Depending upon the V6, you may have to rewire the in-tank pump when the ECM is disabled. "

so i was wondering.....

1. How exactly is an oil pressure safety switch installed?

2. How would one go about rewiring the in-tank fuel pump?

3.Can the in-tank fuel pump be disabled without dropping the tank and be run to a 3-port regulator then to a holley electric fuel pump? if not, why not?

4.How much power can a v6 in-tank fuel pump feed?

Anyone with any experience or insite please post, need to learn.

 

1.) There should be a threaded hole in the block casting just above the oil filter. Grab a switch from a TPI car, and plumb that into your fuel pump relay pull wire. This way, the relay can't close unless there's oil pressure.

2.) Rewire it to do what?

3.) Disable the in-tank pump, yes. Install a regulator *before* the new fuel pump...no. What pressure is the regulator going to regulate?

4.) 12VDC.

 

If you disable the in tank pump, its gotta come out. You may as well run a mechanical pump, if you dont want to use the intank.

 

I have not been able to get consistent information about this. Apparently, some of the V6 models controlled the pump via the ECM and others didn't. I don't have any direct experience with that (my car was carb'd with mechanical pump), and those who have posted here report different experiences.

If anyone has definative information, I'm all ears.

 

Some chose to run an in-line electric rather than the in-tank. That's viable, especially since some later V8 blocks don't have the mechanical provision machined - and the in-tank are prone to failure and expensive. But, the in-tank should come out in that case.

 

the 2.8 ecm & the 3800 pcm control the fuel pump on my ride. (now let other yrs chime in w/the different versions)

 

I believe if it came equipped with VATS. The ECM was in charge of the fuel pump.

 

I agree, I should have mentioned that about the later blocks without mechanical provisions. As far as the electric in-line, If I were going to run anything but a mechanical thats the way that I would go.

 

I was very close to getting my hands on a '93 truck block recently, which had no mechanical provision. Since I don't currently have an electric pump, an in-line electric would have been the way I would have gone.

 

okay so now that i got a good number of people interested here's what i got...

92 iron 350 block with no mechanical pump provisions
89 firebird w/ 2.8L fuel injection and 5 spd with stock rear

1. i want to know if i can bypass the in-tank pump and just run the lines to a new holley red fuel pump and then to a regulator. i allready have the pump so i was wondering if this type of project was possiable without dropping the tank. for one thing i dont even know how to attempt that and secondly i really just want the car on the road as quick and as cheap as possible due to the fact i have alot of money into this project allready.

2. i was wondering how much power (horsepower, not voltage) can a factory equipped v6 fuel injected in-tank fuel pump handle?

Thanks

 

The intank pump can support quite a bit of HP. Not really a concern probably. IF you want to use your inline, you need to drop the tank and take out the one in the tank. It really is the best way, and the proper way to go. And dont listen to people on here about hacking a hole in your car to get to the pump, just drop the tank one time and do it right.

 

So with droping the tank and making it into a pick up only to feed a Holly blue with regulator, would that be enought to properly feed a 350hp+ motor with a 100 shot?

 

For the first part, yes. For the second part, that's a power-adder forum question.