I would like to install a Holley Blue fuel pump or the eqivalent instead of my stock 305 TBI intank pump. My question is do I have to have my tank sumped or is there another way around it. And do i absolutley have to drop the tank down??

 

lol exactly how much work is it to get to tank. from the books, they say u gota under the suspension or sumtin... lol sucks i think i need to replace mines too...what is sump?

 

The best way to do it would be to drop the tank and remove the old pump. This way the new pump won't have to pull fuel through anymore than it has to. A sump would also work best. The external pumps are pushers not pullers. This means that gravity will do the work until the fuel reaches the pump. If the fuel has to travel up the fuel lines and then down again, you might experience some fuel starvation. A sump would privided a "straighter" shot to the pump.

 

BAD91CamaroRS,
YES. You absolutely have to drop the tank to effect a proper repair/replacement of the fuel pump. It's not that big a deal and can be done in an afternoon without too much trouble. Although I'm not sure I would be interested in changing the stock pump unless it were actually bad/non-functional. If that is the case, pull the tank and do it right.

There may be folks that will reply with the "ALTERNATE" method of fuel pump removal (i.e. hack a monster hole in your car's body behind the passenger's seat). This is an often debated "HACK"! that is [IMPO] extremely dangerous and quite honestly [IMPO] really *$*&*@** dumb and lazy. The fuel pick-up assembly is rather large. The amount of time spent hacking up (and patching) the hatch-back area could be used to pull and install the tank properly.

I was able to pull an '82 tank (which is not equipped with the removable filler neck) without pulling the rear or any other major components. If your vehicle is equipped with the stock exhaust you'll need to pull the muffler assy. and that's probably the biggest pain-in-the-butt. If your proposed Holley is an external pump, you'll need to pull the in-tank pump and replace it with a length of good fuel hose long enough to reach the bottom of the tank. Retain the in-tank "Sock" and place it on the end of the hose with a stainless steel clamp.

Hope this helped.

Sincerely,
Kurt

 

A sump is something you have welded to the bottom of the tank with usually 2 holes for fuel lines that go to external fuel pumps.
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The reason I need a new fuel pump is because the stock 305 TBI pump hardly supplies my 355 with enough fuel as it is and I have a nitrous kit for the car, but I cant use it untill I get a bigger fuel pump. Has anyone actually tried the rubber hose with the sock on the end in the tank and been succesful with it??

 

I'd probably stick with the in-tank pump and just upgrade to a higher LPH unit like the Walbro 190 or 255lph units. For example here is a 255lph unit made for our cars from a TGO supplier: Hawks Third Gen Parts-82-02 Camaro and Firebird Parts - Camaro or Firebird 85-92 In Tank Fuel Pump, 255 lph 5.0L or 5.7L

 

I would rather just get an external fuel pump so I can have it hooked up to a on/off switch. I have the Holley blue pump already and don't see spending $200 for an intank pump. Also the walbro pump doesnt seem like the best option especially since i dont have fuel injection anymore. I would like to just sump the tank and get it over with so i can have two fuel lines, one for the motor and one for the nitrous.

 

Sorry Bad91, I didn't know you had dropped the TBI. Since you're not EFI anymore AND you want to run nitrous then I say, by all means, Sump it and Pump it!...(but you'll still have to drop that tank).

 

Yes. That's why I mentioned it. Converted a Cross-Fire TBI to Carb and removed the in-tank pump in favor of a Block-Mounted Standard. A small length of hose works perfectly.

Kurt

 

Thanks guys... I think if I'm going to take the tank down I'll just end up having a sump welded in and do it the right way the first time... I'm just leary about the hose idea because I dont want to spray this motor and starve it of fuel and blow it to pieces