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Old 12-06-2017, 07:04 PM   #1
hillbillyrider
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acting like runs out of gas at speed

94 1500 with 4.3 and 5 speed tans. currently working on 2 different problems. I have another thread on the engine not reaching operating temp. But I have another issue as well that i need to address. I have had the truck for about 2 weeks. traded my ford to it which so far has been a mistake. anyway, the other problem I am having is the truck acts like it runs out of gas when maintaining speed. it does not matter at what speed or rpm. If I hold it there long enough it will just die. but starts right back. It starts real easy and idles great. runs through the gears strong. it only happens after reaching cruising speed whether it be on the highway or little back roads. i can push in the clutch and rev it up like nothing is wrong. I can come to a stop and it pulls strong through the gears but happens again when at constant throttle. I can not get it to happen in the driveway in neutral and holding it at a constant rpm. So far I have replaced the fuel filter and tried it with the CTS unplugged with no change. I currently have the bed off and will check the rubber hose tomorrow but from what i could tell it was in good shape. It got dark and cold on me lol. I hope it wont take much to get this thing up and going good. So far I regret trading my ranger to it.
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Old 12-07-2017, 03:05 PM   #2
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Re: acting like runs out of gas at speed

The rubber hose is in good shape. No leaks that i can see anywhere. What could be causing this. Very frustrating to drive like this. When it happens I can floor it and it will kind of straighten up but feels a little underpowered. I don't understand it. It does great revving it and going through the gears. Only happens while maintaining speed. It simply acts like it is running out of gas.
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Old 12-07-2017, 03:32 PM   #3
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Re: acting like runs out of gas at speed

Has it been tuned up? Check fuel pressure? Timing ok? Don’t forget it’s a v-6, they usually fall on their face lol....
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Old 12-07-2017, 05:05 PM   #4
TennesseeZ
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Re: acting like runs out of gas at speed

That sounds like a clogged fuel filter
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Old 12-07-2017, 05:45 PM   #5
hillbillyrider
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Re: acting like runs out of gas at speed

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Originally Posted by b454rat View Post
Has it been tuned up? Check fuel pressure? Timing ok? Donít forget itís a v-6, they usually fall on their face lol....
it dont fall on its face. It has plenty of power going through the gears. this only happens when maintaning speed
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Old 12-07-2017, 05:47 PM   #6
hillbillyrider
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Re: acting like runs out of gas at speed

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That sounds like a clogged fuel filter
Already changed it. No change.
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Old Yesterday, 04:12 PM   #7
hillbillyrider
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Re: acting like runs out of gas at speed

so after more time and money there is still no change. I installed a new pump and strainer and it still happens. 2 things i noticed today. first is if i go through the gears hard then push the clutch in the rpm falls to zero and fluctuates between 0-500 for a couple seconds then goes back to normal. second is I was really pissed off because it is still happening so i stopped and did a burnout. it did great for about a second then acted like i completely shut the fuel off. tried it a second time and same thing. So after a new pump, strainer and filter it still does the same ****. I unhooked the map sensor and it wouldnt hardly run at all. Plugged it in and unhooked the tps and it ran bad again. so i believe they are working. any ideas?
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Old Yesterday, 06:25 PM   #8
Sixball
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Re: acting like runs out of gas at speed

Catalytic converter clogged up ?
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Old Yesterday, 06:48 PM   #9
hillbillyrider
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Re: acting like runs out of gas at speed

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Catalytic converter clogged up ?
nope. I wonder if one of rubber fuel lines is collapsing. i dont know what else it could be.
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Old Yesterday, 08:31 PM   #10
4x4k30
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Re: acting like runs out of gas at speed

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Originally Posted by hillbillyrider View Post
nope. I wonder if one of rubber fuel lines is collapsing. i dont know what else it could be.
check the fuel line where it goes in to the back of the throttle body I have seen rubber from the in tank short rubber fuel pump hose get in it and will clog up there easy to check just undo the fuel line where it goes into the throttle body and look if you see black stuff
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Old Yesterday, 08:35 PM   #11
ChevyTech
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Re: acting like runs out of gas at speed

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... Check fuel pressure? ...
I agree!

Check the fuel pressure.

It does not matter that the pump is new, you still need to test the pressure with the engine running.
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For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If it is modified from what came stock from the factory, let us know that too.
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Old Yesterday, 08:52 PM   #12
4x4k30
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Re: acting like runs out of gas at speed

For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If it is modified from what came stock from the factory, let us know that too. yes all that info will help I worked at a wrecker dealer in the shop a long time ago every time I picked a phone call from a customer they would just ask is my truck ready yet? lets see there are 40 to 100 trucks out in the yard I would just say almost I got my 3 best men working on it rite now..
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Old Yesterday, 08:55 PM   #13
hillbillyrider
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Re: acting like runs out of gas at speed

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Originally Posted by 4x4k30 View Post
check the fuel line where it goes in to the back of the throttle body I have seen rubber from the in tank short rubber fuel pump hose get in it and will clog up there easy to check just undo the fuel line where it goes into the throttle body and look if you see black stuff
Great idea. Get on that tomorrow. Thanks
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