Can a new mechanical pump,or electric, be used with the stock pump still in the tank? or wouldnt it be able to pull through it?

 

If the in tank pump still works, just get rid of the mechanical pump all together and run a regulator to get the pressure down.

 

I dont want to use the stock electric pump, but dont wanna drop the rear and everything to take it out. I want to use either a mechanical pump or a Holley electric pump. But would either of those be able to pull the fuel through the stock pump that isnt running?

 

I couldn't pull through my in tank TPI pump. Had to remove it.

 

Damn. Oh well, just more work to do...

 

That was one of the last things i did dude its not really all 2 bad, might as well change the rear shocks and some other crap while ur back there just to make it all worth it ya know.

 

steve, just keep the in-tank pump and your regulator setup.... why go to all that extra work when the car still has a perfectly good fuel pump in it?

it doesn't make sense.

 

I got a buddy that has an 89 RS which he pulled the 305 and dropped in a carb'ed 350... he is running an external pump to his carb and he left the stock in-tank pump... it pulls through his...

 

Itll pull through the pump until the intank pump goes out. Then hell have to drop the tank non the less. If hes plannin on selling the car any time in teh future then ya might as well not drop it. But if you plan on keeping it ur gonna drop the tank sooner or l8r its just a matter of when.

 

How long do the stock in tank pumps usually last? Mines an 88 with 145k on it, and for the past 3k its been with the carb setup instead of the original fuel injected, so its been running constantly when the car is on.

 

Couldnt tell ya, mine still worked (I yanked it cuz i thought it went out but it was the oil pressure shut off thingy) at 170k, my friends went out at like 130k.

 

Why though? Why waste hp with a mechanical pump when you already have a good electric pump to use?

 

Because I dont know that I have a good electrical pump! Sure it might work, but why risk it and not just take it out when the car is getting worked on anyway? It would be better to change it when the car is on the lift, than have it breakdown somewhere and have it towed.

 

A Fuel Pressure Gauge is like 10 bux.

 

um...ok I already have one....

 

Dude, you are currently using a mechanical pump in junction with ur electric pump correct. Now if thats all figured out. If your electric intank pump goes out, your mechanical one will not be able to pull fuel through it non the less. So if ur electric one goes out ull be stuck somewhere regardless.

 

from what i've read so far it sounds like he hasn't done either yet. still on the in-tank

 

I am currently using the stock in-tank electric pump. I wanted to know if another pump,mechanical or electric, would be able to pull fuel through that stock pump when its not running. I have gotten a yes and a no, so I think I am just gonna remove the stock pump and run a mechanical.

 

That is the proper way to do it...you will eventually have to do it sometime....

 

No it's not, the proper way would be tun run an electric pump with a regulator. You'll just be wasting hp with the mechanical pump, but whatever floats your boat.

 

I agree just use a regulator till it goes out. Then when it does go out get another electric (NON intank one)