LT5 fuel pump?

[limo1988]

I have a 1990 ZR1 and I think I may have a failing fuel pump. What I would like to know: Is there a specific LT5 fuel pump and where can I buy it? Where specifically is the location on the LT5 for the connection for a fuel pressure gauge? Any help would be appreciated...

[Kevin]

buy 2 454 cid chevy suburban pumps.

[secondchance]

Fuel pressure gauge can be hooked up at Schrader valve on the passenger side fuel rail close to the alternator.
Pic was to show how I hooked up a capacitor but shows Schrader valve also.

[limo1988]

Kevin, thanks for the reply. Why (2) 454 pumps? The standard 1990 Corvette fuel pump(1) mounts below the gas cap. ?? I just don't know if I should be looking for a special LT5 pump or just buy a standard 1990 pump.

[Kevin]

The zr-1 has two fuel pumps from a 454 suburban. I just did mine. Be ready with some wd40 and steel wool to clean up any rust you find on the assembly. You will have to reuse the...ah crap the name escapes me after work and two beers.

[WVZR-1]

Any 'off the shelf' replacement for the GM part #'d pump 25163473 is considered a 'replacement' equivalent and there are many choices. A search of just "fuel pump" will offer up pages of reading and some is very good reading. There is a primary and secondary pump so you might consider doing the 'pair'.

Here's a thread that's several pages long that mentioned a different replacement with assembly snapshots done by a 'talented' owner. It's a good read:

http://www.zr1.net/forum/showthread....mp+part+number

[ZRXMAX]

The 454 pump is from the 96 Suburban as I recall... I know that is what I put in mine years ago.

As WVZR-1 says ( and he knows ) you will get the replacement parts for a fair price in the end.

[cvette98pacecar]

Originally Posted by limo1988

Kevin, thanks for the reply. Why (2) 454 pumps? The standard 1990 Corvette fuel pump(1) mounts below the gas cap. ?? I just don't know if I should be looking for a special LT5 pump or just buy a standard 1990 pump.

If your unit holds one pump you will need to buy the correct fuel pump assemble for two pumps.

[Hog]

Just so you guys know, the 1996- EP381 (25163473) is used on the Vortec 4.3 V6, the Vortec 305(L30), 250 (L31) and Vortec 454(L29). $70 from Rock Auto, sock not included.
The stock fuel pressure on the V6 and 305/350 is 63-66psi, and the pump will push 100psi if deadheaded.
These pumps are called for my Chev Performance Parts for the 502hp Ramjet 502, 4the all aluminum 493hp Ramjet Zl1 and 350hp Ramjet 350 crate engines.

You should have plenty of fuel for the highest output of LT5's.

[cvette98pacecar]

Originally Posted by Hog

Just so you guys know, the 1996- EP381 (25163473) is used on the Vortec 4.3 V6, the Vortec 305(L30), 250 (L31) and Vortec 454(L29). $70 from Rock Auto, sock not included.
The stock fuel pressure on the V6 and 305/350 is 63-66psi, and the pump will push 100psi if deadheaded.
These pumps are called for my Chev Performance Parts for the 502hp Ramjet 502, 4the all aluminum 493hp Ramjet Zl1 and 350hp Ramjet 350 crate engines.

You should have plenty of fuel for the highest output of LT5's.

What is the flow rate on a stock pump. I was looking at some aftermarket pumps last night that flow up to 350 Lph.