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  1. #1

    Default 90 Suburban Brand new rebuilt 350 but NO fuel?

    Alright first lets start with what I know:

    The injectors are good (7 & 8 ohms)
    They are getting constant voltage
    No contiuity to ground on the lead to the injectors (read by a vom, maybe not good enough?)
    Fuel is coming to the TB:
    First hooked up to the primer with a connection to the battery, and out came fuel
    Brand new fuel pump relay
    turned the key to on and got a little bit of fuel
    Going to put a fuel pressure gauge on the lines tomorrow
    I figure that since the primer got fuel to the TB fast, the filter is good, and the pump is good
    I am not sure if the ECM is good no one will test it out of the vehicle
    The oil pressure sending unit is good- I have oil pressure according to the gauge
    I cannot figure this out and I am very anxious to here this new motor run
    74 4X4 1/2 Ton Short-bed (wrecked- rolled twice)
    84 Camaro (in progress)
    90 4X4 1/2 Ton Suburban

    When in doubt...Put it to the floor!
    If that didn't work...You need more Horses!

  2. #2
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    Default

    I would wait for the fuel pressure results before you go any further. I am assuming the truck ran and the motor went out?? If so then there is a chance that you have a ground out of place or else the pump went bad from sitting as we all know they can. and fuel can get to where it is going very quickly at half the PSI required (not trying to sound patronizing just stating from experience)
    Also have you checked the ignition side yet?
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  3. #3

    Default

    Yeah the truck ran...and the distributor is brand new and I have spark. It runs priming with gas into the TB. I, kind of, hope it is the pump and not the ECM.
    If anyone has more advice on what to look at tomorrow please let me know.
    Last edited by Roddin Burbin; 08-28-2010 at 07:54 PM.

  4. #4

    Default

    You say its a brand new rebuilt motor. Did you pinch a fuel line when installing engine?

  5. #5

    Default

    No the fuel lines all look good...This problem has been a stumper for about two weeks...I have exhausted most all of the obvious.

  6. #6

    Default

    Well I have to agree with Murdog94, wait for fuel pressure check.

  7. #7

    Default

    Guys, first I want to thank you for your help. Second, She started, after finding the wire going to the positive terminal to the alternator!! Damn I feel stupid!! Any way, she is now running and I took her out on the town! I got many looks with the open headers yelling at everyone, ha ha! Even some preppy boy in a nice camaro had to admire the beautiful notes she was puttin out! She is done (engine wise) pics to follow on my page and as my post pic (I just gotta clean up under her hood!) I am planning to take her to work and school tomorrow, a 30 mile drive- one way (wish me luck).

    ps. This is my first engine swap, and I am JACKED!!!!

  8. #8
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    Glad its running great.... Good luck with the build and keep us informed.

  9. #9

    Default

    Quote Originally Posted by murdog94 View Post
    I would wait for the fuel pressure results before you go any further. I am assuming the truck ran and the motor went out?? If so then there is a chance that you have a ground out of place or else the pump went bad from sitting as we all know they can. and fuel can get to where it is going very quickly at half the PSI required (not trying to sound patronizing just stating from experience)
    Also have you checked the ignition side yet?
    Okay I will wait for the fuel pressure result. But how many days, weeks, or months should I wait? PM me for that. :D

  10. #10

    Default

    Glad you found your problem. Keep in mind that with distributor based systems, even fuel injected, it's possible to have spark and still not have power to the ECU. Troubleshooting order should be: ecu power/ground, fuel pump power/ground, fuel pump pressure, injector power, ecu feed from distributor (crank/cam signal).
    1986 Chevy G20 Tow Rig - 5.7 TBI conversion
    1978 Mustang II King Cobra Road Racer - Holley 650, MSD 6AL, 5 speed, 10 point Roll Cage, 9" posi, fuel cell, custom interior.

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