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06-26-2022, 01:35 AM
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#1 |
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Registered User
Join Date: Jun 2010
Location: Encinitas, CA
Posts: 507
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TBI question
I have a 42 Chevy truck, that is on a 70 chassis. I put a 74 El Camino gas tank in the back. I have a 5.7 TBI engine with computer. I am looking for a fuel pump with 3/8 lines. I want to mount it in line. I can find fuel pumps but not rated for TBI. Maybe there is an in tank version that will fit in the small hole of the El Camino. Any suggestions?
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1954 GMC on 93 Silverado chassis http://67-72chevytrucks.com/vboard/s...d.php?t=408344 1942 Chevy 1/2 ton Pickup http://67-72chevytrucks.com/vboard/s...d.php?t=429494 R.I.P. TOM SEFFRON 68 FOUR DOOR http://67-72chevytrucks.com/vboard/s...d.php?t=495438 1942 Chevy that ate my brain 70 Chassis https://67-72chevytrucks.com/vboard/...d.php?t=835250 |
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06-26-2022, 06:53 AM
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#2 |
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Registered User
Join Date: Jul 2014
Location: North-central Virginia
Posts: 1,099
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Re: TBI question
A stock GM tbi system needs 12-15 psi. A LS requires 58 psi. Any pump that will feed a LS will also feed a tbi; the tbi fuel pressure regulator will just open up earlier to dispose of the higher pressure, and keep the pressure within check.
When shopping for pumps, look for anything that's labeled for fuel injection use. They should all be capable of feeding a tbi, and most could feed a LS. Avoid pumps that are labeled for carburetor use, since those aren't designed to run at more than 3-4 psi. The GM tbi unit has the fuel pressure regulator built in to it, so you don't need to worry about an external regulator on those.
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1987 C6P V20 truck, 2010 LMG 5.3, AFM delete, 2010 Camaro exhaust manifolds, 1997 nv4500, 1991 np241c, hydroboost, 2005 14bff axle & driveshaft, drop-n-lock gooseneck, 4.10 gears, stock suspension, rims, and tires. Still a work in progress. Any questions or suggestions are welcome! |
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06-29-2022, 02:33 AM
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#3 |
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Registered User
Join Date: Oct 2015
Location: PNW
Posts: 3,508
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Re: TBI question
I have no idea what would fit in your tank, but I have a TBI 350 and recently replaced the fuel pump and I went with an EP 377. It doesn't move as much fuel as the pumps for an LS motor, but it moves more than the one for the stock 350. Definitely notice the difference at the pedal.
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06-29-2022, 08:16 AM
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#4 |
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Registered User
Join Date: Jul 2014
Location: North-central Virginia
Posts: 1,099
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Re: TBI question
Do a google search for "in tank pump ls swap Chevelle". The Chevelle is very similar to the El-Camino you pulled your tank from, but is a more common platform for ls swapping.
One option I saw was to use a 1995 Impala tank, which is already baffled and built for an in-tank pump, and is supposedly a close fit with a Chevelle.
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1987 C6P V20 truck, 2010 LMG 5.3, AFM delete, 2010 Camaro exhaust manifolds, 1997 nv4500, 1991 np241c, hydroboost, 2005 14bff axle & driveshaft, drop-n-lock gooseneck, 4.10 gears, stock suspension, rims, and tires. Still a work in progress. Any questions or suggestions are welcome! |
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06-29-2022, 09:19 AM
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#5 |
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Active Member
 
Join Date: Jan 2017
Location: Traverse City, MI
Posts: 169
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Re: TBI question
I am using a 1992 Buick Road Master tank for my LS swap on my 1975 Laguna, it is the same tank as the 1994-1996 Impala SS and a common tank to use on a fuel injection swap on 1970-1977 Chevell/Monte Carlo's. Your 1974 tank will not accept in in-tank fuel pump through the original hole, you would need to modify the tank to do that. Using a 1990-1996 B Body tank you can use the stock sending unit and run either a TBI/LT1 or Vortec fuel pump as they are externally the same.
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