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Thread: Need Help ASAP

  1. #1

    Default Need Help ASAP

    I have a '98 K1500 Chevy Suburban 5.7L fuel injected
    I was driving along and it just died with no warning. Other than my dual exhaust you really cant hear the truck run under normal circumstances.
    I have spark, fuel pressure is 60+, new fuel filter, tune-up done regularly, oil etc. Well maintained. I was driving and it just died, no warning of anything, died as if I turned the key off. Since not starting, cranks over as if to start, checked the fuel line with pressure gauge 60+. Poured gas into the barrel runs like a champ until gas runs out, also sprayed starting fluid into airflow for barrel again ran like a champ until used all that was sprayed. Highly confused on what the problem is, checked relays, fuses under hood and in door panel all good nothing blown.
    The only thing that has been different that I can consider a warning sign is that this past week the truck would take 2 key turns to start and run as in 1st key turn (and only for about .5 seconds turn) start then abruptly die out. 2nd key turn (same time) full running.

    Any ideas and help would be most appreciated.

  2. #2

    Default

    check your relay for your fuel pump. sometimes they can go bad, and or get to hot. mine was doing that but mine was due to a bigger fuel pump on a stock wiring harness.
    2004 gmc sierra ext z71 5.3
    PERFORMANCE...
    KB racing hot pipes 3.5" : 76mm turbo: 4l80e : Circle-d 2b multi disk :Walbro 400 : Racetronix Hotwire kit : TB coolant bypass : Nelson 91 Pcm : Tr 220 Cam : Brian Tooley double springs kit : Ls7 Lifters : Stage 3 heads : Custom Intake Manifold :80lb Injectors : Ported TB : 40k tranny cooler: Plx dm-100 gauge: Auto meter fuel and boost gauge:
    APPEARANCE...
    Custom Speedo : Leveling kit :Smoked led taillights and 3rd break light : Black projectors and fogs with hids : Blacked out grille : 33's on 16's : Clarion flip screen: sound que 12" subs: clerion 6x9's : Memhpis amps: Alpine componet set.
    Future mods... Detriot tru-trac, deviels own stage 2 meth kit, MORE BOOST!!!!!!!!!!!!!!

  3. #3

    Default

    Checked not hot fuel pump running fine
    Taz

  4. #4

    Default

    so its running fine now? id run some injector cleaner maybe a bad batch of gas. we had a bad batch about 3 months ago in town and 2 guys at work had the same thing happen. one eneded up clearing up after 2 tanks and running cleaners. the other guy had to replace his fuel pump. hop this helps.
    2004 gmc sierra ext z71 5.3
    PERFORMANCE...
    KB racing hot pipes 3.5" : 76mm turbo: 4l80e : Circle-d 2b multi disk :Walbro 400 : Racetronix Hotwire kit : TB coolant bypass : Nelson 91 Pcm : Tr 220 Cam : Brian Tooley double springs kit : Ls7 Lifters : Stage 3 heads : Custom Intake Manifold :80lb Injectors : Ported TB : 40k tranny cooler: Plx dm-100 gauge: Auto meter fuel and boost gauge:
    APPEARANCE...
    Custom Speedo : Leveling kit :Smoked led taillights and 3rd break light : Black projectors and fogs with hids : Blacked out grille : 33's on 16's : Clarion flip screen: sound que 12" subs: clerion 6x9's : Memhpis amps: Alpine componet set.
    Future mods... Detriot tru-trac, deviels own stage 2 meth kit, MORE BOOST!!!!!!!!!!!!!!

  5. #5

    Default

    No it's not running. that's the problem.

    - - - Updated - - -

    I always use the same gas from the same station I use 87 octane and every other fillup run Lucas thru it and every oil change run Lucas thru that too
    Quote Originally Posted by darnie1987 View Post
    so its running fine now? id run some injector cleaner maybe a bad batch of gas. we had a bad batch about 3 months ago in town and 2 guys at work had the same thing happen. one eneded up clearing up after 2 tanks and running cleaners. the other guy had to replace his fuel pump. hop this helps.
    Taz

  6. #6

    Default

    humm let me do some more digging and maybe i can come up with somemore ideas. is the fuel pump kicking on and holding constant pressure?
    2004 gmc sierra ext z71 5.3
    PERFORMANCE...
    KB racing hot pipes 3.5" : 76mm turbo: 4l80e : Circle-d 2b multi disk :Walbro 400 : Racetronix Hotwire kit : TB coolant bypass : Nelson 91 Pcm : Tr 220 Cam : Brian Tooley double springs kit : Ls7 Lifters : Stage 3 heads : Custom Intake Manifold :80lb Injectors : Ported TB : 40k tranny cooler: Plx dm-100 gauge: Auto meter fuel and boost gauge:
    APPEARANCE...
    Custom Speedo : Leveling kit :Smoked led taillights and 3rd break light : Black projectors and fogs with hids : Blacked out grille : 33's on 16's : Clarion flip screen: sound que 12" subs: clerion 6x9's : Memhpis amps: Alpine componet set.
    Future mods... Detriot tru-trac, deviels own stage 2 meth kit, MORE BOOST!!!!!!!!!!!!!!

  7. #7
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    Default

    Putting fuel directly into the air intake and the engine runs until the fuel is exhausted suggests a fuel system problem. When you check the fuel pressure, it reads 60 +, what happens when you stop cranking the engine, does the fuel pressure hold, bleed off slowly or drop off immediately?

    Relays can be tricky. The A/C and fuel pump relay are the same as I recall. If your A/C has been running well, swap out the fuel relay with the A/C relay. This will rule out the relay completely and you can move on. Does the relay feel secure in the socket, not loose?

    How was the truck running prior to this problem? You said it was quite, did it use oil? Idle smoothly? Might want to pull the dipstick and see if there is water in the oil.
    86 911 Porsche Carrera
    98 K1500 Suburban LT
    2012 Nissan Leaf

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