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06-05-2022, 05:15 PM | #1 |
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Join Date: May 2014
Location: Mission BC
Posts: 452
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Swapping an LS into a 50 GMC fuel questions
I am swapping a 2004 4.8/4L60E into my 50 GMC on an s10 frame.
I bought the motor and tranny for $1000 and when I removed the vortec cover the intake had a large hole in it near the MAP sensor on the top. This manifold is returnless, and DBW. I obtained another manifold off a friend that is DBC and swapped the DBW throttle body onto it and ran fuel and return as it has a return line. I repin my own harness and delete VATS etc with HPTUNERS. I have done a few of these swaps. Truck cranks and starts for about 2 seconds but does not run. Fuel pressure is about 50PSI and falls off quick when pump shuts off (after the 2 second run form the ecm). Fuel relay has power during crank and run. Question 1 Are the manifolds interchangeable or should I grab another DBW instead of the DBC. Question 2 Why would fuel pressure fall off so fast after pump stops? Is their a check valve I am missing or is the fuel regulator leaking? Leaky injector? Question 3 If I have the Tach module wired correctly should the throttle body flapper move with key on and pedal pushed? Thanks.
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1962 C10 Longbox LS 5.3 4L60E----Sold$$ 2014 Ram 4x4 3500 Laramie Diesel..Momma's truck 2015 Ram 4x4 1500 1997 Boxster. 1972 K10 Custom Deluxe LS 6.0 1950 GMC 3100 S10 & LS swapped |
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