Heavy Metal Posted March 16, 2009 Author Report Share Posted March 16, 2009 being a 89 could you have a bad tank....rust getting in the filter...had rust in my 88 s-10 and clogged it up...just a thoughtI got a good look inside the tank when I changed the pump. It looked very clean. I had an old Jeep Wagoneer with a rusted tank, so I was on the lookout for that. Quote Link to comment Share on other sites More sharing options...
Heavy Metal Posted March 16, 2009 Author Report Share Posted March 16, 2009 I've been thinking about this one, I'm pretty stumped myself. Everything I think of you've already replaced. Do you know what it's losing? Fuel or spark? Next time it does it pull a spark plug wire off and see if it sparks when someone turns it over. Or pull the breather off and see if the injectors are spraying into the TBI.i don't know man, I noticed that both injectors stutter at the same moment, which would normally say....sensor or something stopping the fuel flow...and definitely only after it warms up and drops the idle down. Quote Link to comment Share on other sites More sharing options...
Missilelock Posted March 17, 2009 Report Share Posted March 17, 2009 Does it have 2 fuel filters? the old ones did. one was where the fuel line went into the carb. Quote Link to comment Share on other sites More sharing options...
Bob LeBlanc Posted March 17, 2009 Report Share Posted March 17, 2009 Have you tried to treat the gas for water?...I had a Ford that acted this way and it was a bad batch of gas...would run for awhile, and you could even drive it...but then it'd start to 'struggle' and die. Let 'er sit for 10 or 15 minutes, and away she'd go. Where your truck has been sitting for a bit, there may be some condensation that has built up in the tank. Get some gas-line anti-freeze (or I think there is a specific treatment you can buy for water)...dump 'er in the tank and see if it helps. If it works, you should probably replace the first in-line filter, again. Bob Quote Link to comment Share on other sites More sharing options...
Heavy Metal Posted March 17, 2009 Author Report Share Posted March 17, 2009 Does it have 2 fuel filters? the old ones did. one was where the fuel line went into the carb.hmmm, not sure. Maybe it does? I'm gonna check, thank you so much! I just replaced the big obvious one under the frame on the passenger side. It is possible though there is a little screen filter like on the old carburaters, on the throttle body carb. Quote Link to comment Share on other sites More sharing options...
Heavy Metal Posted March 17, 2009 Author Report Share Posted March 17, 2009 Have you tried to treat the gas for water?...I had a Ford that acted this way and it was a bad batch of gas...would run for awhile, and you could even drive it...but then it'd start to 'struggle' and die. Let 'er sit for 10 or 15 minutes, and away she'd go. Where your truck has been sitting for a bit, there may be some condensation that has built up in the tank. Get some gas-line anti-freeze (or I think there is a specific treatment you can buy for water)...dump 'er in the tank and see if it helps. If it works, you should probably replace the first in-line filter, again. Bob I'll give this a try since it's not gonna cost me a ton of time and money. Thanks! Quote Link to comment Share on other sites More sharing options...
Heavy Metal Posted March 17, 2009 Author Report Share Posted March 17, 2009 Oh...and by the way I tried a Chevy forum and have gotten ZERO posts/replies in two weeks. And from the other ones I've looked around on, they are deader than a doornail. I saw threads asking questions similar to mine and different that were 3 years old with zero replies. Quote Link to comment Share on other sites More sharing options...
Texan_Til_I_Die Posted March 17, 2009 Report Share Posted March 17, 2009 Did you ever check your exhaust for excessive back pressure? If your system is bolted together, unbolt it in front of the catalytic converter(s) and pull it apart. Run it with straight exhaust for awhile and see what happens. Quote Link to comment Share on other sites More sharing options...
Heavy Metal Posted March 17, 2009 Author Report Share Posted March 17, 2009 Did you ever check your exhaust for excessive back pressure? If your system is bolted together, unbolt it in front of the catalytic converter(s) and pull it apart. Run it with straight exhaust for awhile and see what happens.No I didn't, I will do this as it is "free", LOL! Thanks man. Quote Link to comment Share on other sites More sharing options...
brownie65 Posted March 17, 2009 Report Share Posted March 17, 2009 worked on a vehicle once that did something like this. Changed fuel pump, ran great but just for a couple of minutes. There is a sensor in the air cleaner tube / housing somewhere around the air filter. I actually found a fly in the probe end of the sensor. It was blocking the air flow thru the sensor & killing it but would start right back up after a few minutes. It was purely by chance & luck that I found this. These can also go bad & cause this problem. Something I or nobody else thought about before changing the fuel pump. You might check yours. Don't know if it could be your problem but possibly. Quote Link to comment Share on other sites More sharing options...
Heavy Metal Posted March 17, 2009 Author Report Share Posted March 17, 2009 worked on a vehicle once that did something like this. Changed fuel pump, ran great but just for a couple of minutes. There is a sensor in the air cleaner tube / housing somewhere around the air filter. I actually found a fly in the probe end of the sensor. It was blocking the air flow thru the sensor & killing it but would start right back up after a few minutes. It was purely by chance & luck that I found this. These can also go bad & cause this problem. Something I or nobody else thought about before changing the fuel pump. You might check yours. Don't know if it could be your problem but possibly.Thanks neighbor! Quote Link to comment Share on other sites More sharing options...
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