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Old 03-30-2014, 05:57 PM   #1
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Unhappy Engine problems on a 1989 gmc r3500 with a 454 tbi.

my old truck is randomly sputtering.its like it don't get any gas but when it does it you can put it in neutral and it will run fine but put it back in drive and it will do it agian.they are completely random.it wont do it every time but most of the time.ive changed the plugs and the wires and fuel filter.
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Old 03-30-2014, 08:41 PM   #2
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First thing that comes to my mind is a week fuel pump or the ignition module is going out. To check the fuel pressure is a bit tricky on that engine and Requires a test adapter to install at the fuel filter or the TBI.
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Old 03-30-2014, 09:29 PM   #3
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That or the rubber fuel line between the pump and sender has a crack.
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Old 03-30-2014, 09:38 PM   #4
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That or the rubber fuel line between the pump and sender has a crack.
wouldnt it not start if theres a crack in that little line between the sender and pump inside the tank?
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Old 03-30-2014, 11:54 PM   #5
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No not at all. A cracked line would still send fuel through the lines, but you will be low on pressure and volume. A cracked line would cause a low power concern when driving , but vehicle would still be able to idle.
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Old 03-30-2014, 11:57 PM   #6
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No not at all. A cracked line would still send fuel through the lines, but you will be low on pressure and volume. A cracked line would cause a low power concern when driving , but vehicle would still be able to idle.
could that be why it seames to be getting a little worse and why it only does it when it needs gas the most during acceleration
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Old 03-31-2014, 11:12 PM   #7
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Its very possible.
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Old 04-07-2014, 07:23 PM   #8
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drove it for a little while know an seems to be fixed ty guys for the help.it was prbly just the line because it was like it melted and cracking but i went ahead and changed the pump so i dont have to take the tank off agian.
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Old 04-07-2014, 10:57 PM   #9
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Best part is them pumps are not expensive like the newer ones.
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