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06-14-2018, 08:35 PM | #26 |
Member
Join Date: Jan 2011
Location: Stuart, Florida
Posts: 458
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Re: '89 K1500 engine replacement help
Wow, there it is. If you knew how much I looked for that before I asked..... We plan on working on it this weekend. Have a mechanical pump, just need to make a metal fuel line to carb and route fuel supply to pump. Much easier than fighting all the other problems we kept running into. We'll keep everyone posted on how it goes. And yes, we're going to install a new oil pressure switch, however we did already install a mechanical gauge. At least this way the factory dash work hopefully work correctly.
Thanks, David
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1970 CST LB Fleetside, 402 BB, PS, PB,AC 1968 Firebird 400 conv. 1965 Chris Craft 17' wood ski boat (SN #0001) |
06-15-2018, 12:32 PM | #27 |
Registered User
Join Date: Feb 2016
Location: Omaha, NE
Posts: 38
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Re: '89 K1500 engine replacement help
Why not just wire in a new fuel pump relay that isn't triggered by the ECM?
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1988 Chevrolet C1500 RCSB |
06-21-2018, 05:20 PM | #28 |
Still plays with trucks
Join Date: Jul 2009
Location: Spokane, WA
Posts: 3,556
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Re: '89 K1500 engine replacement help
The stock TBI fuel pump is not capable of flowing enough fuel to feed even a 300 hp engine without it going dangerously lean let alone a 400 hp one.
Replace the stock TBI fuel pump with a high volume in-tank pump with a flow rate of at least 255-LPH or an external mechanical fuel pump and a bypass style fuel pressure regulator returning the excess fuel to the tank using the stock TBI system return line.
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miSSed opportunity - ground up creation of an AWD 1994 454 SS that never was http://67-72chevytrucks.com/vboard/s...d.php?t=795577 69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been 69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc 68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E 79 Malibu TPI 350 4L60 w/ Z28 steering & sway bars |
06-21-2018, 08:21 PM | #29 |
Senior Member
Join Date: May 2004
Location: Binghamton, NY
Posts: 3,453
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Re: '89 K1500 engine replacement help
My stock replacement pump fueled the 406 in my old truck. Didn't run lean, pulled like a train on steroids....
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