here is the write up
Upgrading the fuel pump
Need a fuel pump upgrade for that super/turbo/nitrous/whatever and dont
want to spend the big bucks from RK or mantapart or whoever?
No problem, I found any easy, cheaper way to do it when my pump went
up a couple weeks ago. After digging through the books and physically
comparing pumps, I installed myself a nice new direct replacement high
pressure fuel pump.
To obtain one of these excellent pumps go to your local parts store
and ask for a pump for one of the following :
'92-'95 S-10 Blazer with a Vortec 4.3 VIN:W
'89 Firebird 3.8
'97 C-1500 Chevy Pickup with a 4.3 Vortec VIN:W, a 5.0, or a 5.7
The GM part number for this pump is 25163473.
All you need is the pump itself, not the assembly, or the sender,
just the small pump. After you get this pump you'll notice 2 small slightly
curved tabs on the bottom. Cut these off, as flush as possible with the rest
of the bottom, dont worry, just a snip. Now the pump is exactly the same
as whats in the fuel tank. So, drop the tank, remove the assembly, then
follow these directions to get to the pump itself inside the assembly.
Unsnap the bottom 'footpad', its usually black in color.
Remove the fuel level sender arm and swing it out of the way, its held on by the 'footpad' thingy somehow. It might be bolted in or sumthin too, depends on the model.
Carefully pry the 3 tabs on the big bottom round part. Start with the single one on the one side, then the 2 on the other side. That was easiest for me, might be different for you. You'll have to pull of the strainer to get it off.
If you look at the top mount plate(the big plastic round thing-usually white) and you'll see where there are 3 slots that the pump cartridge locks into. Twist the cartridge and slide it down.
You'll probably havta kinda squeeze the pump out of the housing, its in there kinda tight, but it'll come out.
Unplug pump and plug in new pump.
Reassemble in reverse order.
Before putting the pump back into the tank, make sure everything is plugged in and have someone turn the key to the on position and make sure the pump runs, so that you know you did everything right.
The specs for the pumps are as follows:
Stock pump - Free Flows 80psi@28gph (gallons per hour)
Operating Flow - 45psi@20gph
New Pump - Free Flows 100psi@47gph
Operating Flow - 51psi@41gph
You'll still need an aftermarket Fuel Pressure Regulator to take full
advantage of the increased flow. And dont run the pressure over
70 psi at the regulator, since this can cause the fuel injectors to
shut down (trust me on this). I run mine at 56 psi all day long,
works great and I still get decent gas milage when my foot isnt on the floor.
