Question about 1996 Chevrolet Astro

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96 Astro Fuel Pump Question?? no start/Flooding

I have a 96' Astro that I am having a cold-no start/flooding situation! My question is, if the fuel pump is failing,....could it cause it to flood on cold starts? I have replaced the distributor,coil,ign. module,coolant temp sensor,plugs/cap/wires, new MFI Injector/Pressure Reg.,fuel filter ,Cleaned & checked the EGR! IfI mess with it usually for an hr or so trying to start it, It will usually start( I have blown off 5 new muflers in the last year with this! After I get it started & let it run for a while It will start the rest of the day just fine. But, Next morning(after it sits all night) It is the same problem( Flooding & just chugs & backfires sometimes! HELP!!!!!!! My curiosity on the fuel pump is because if I just jump in it & crank on it, it will not even fire,....If I wait the 2 seconds for the fuel pump to stop, it will at least chug( but not start) ! Tapping the key repeatedly for 1/2 an hr or so, is usually the only way i can get it running!

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  • cjsargent72 Nov 27, 2008

    Actually,..this does not have the "NUT KIT" Like I believe you are thinking, it is just the steel lines into it! I have replaced the injector with a new Upgraded injector & Pressure regulator! everything on it is new( every sensor ), I am just baffled at what could be the problem as it runs like a TOP, when I finally do get it started, & starts/runs fine all day until i let it sit overnight! Also just to bypass most peoples next thoughts, it does have( 3rd set we have tried) AC Delco Cap/Rotor/Plug Wires,...& 2nd set of New Bosch Platinum Plugs ! I am thinking from a couple of threads I have read, it is the fuel pump! I have heard from a couple of people, that if it doesnt have the appropriate amount of pressure, it will not fire correctly. Its Turkey Day, I am going to buy a fuel pressure guage in the morning,...I will post what I find! *** Anyone has this same problem & have cured it, or has any ideas, PLEASE feel free to email me on this! I AM TIRED OF FEELING BEAT! LOL

  • Mike Canoose
    Mike Canoose Jan 14, 2009

    1996 astro wont start when it sits if i turn key on n off bumping it will start to hit on a few cylinders then run all day no problem it sits u can hold the key on n ware the battery down u bump it it will start after a while no codes fuel pressure 53psi

  • gmtechman May 11, 2010

    Was there liquid fuel present under the upper plenum?

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With the upper plenum removed and spark disabled turn on the key and allow the fuel pump to prime while watching the fuel lines from the back of the intake to the injector. I suspect you lines are leaking. Have seen this before. ALOT.

Posted on Nov 27, 2008

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I have the exact same problem and too have replaced everything. Have you had any luck yet? My van will only start if I bump it too. I am at my wits end. Freind that I used to work with at the chevy dealer says the 4.3L have problems with the valves sticking and has done valve jobs on a few of them.
It runs so dang good when it starts I have a hard time believing it. Once started will be fine all day just like you. Plese respond and tell me what you have found. Thanks Turbinepwr

Posted on Nov 02, 2009

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You will need to replace the fuel pump and check the wiring on the pump.

Posted on Jan 10, 2009

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