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05-16-2016, 02:37 PM
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#1 |
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Registered User
Join Date: May 2016
Location: calgary
Posts: 5
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85 GMC truck hesitates on hills occasionally
Once in a while when going up a hill my truck acts like it is running out of gas.It will be getting gas then not causing a jerking. After getting to the top it will be fine and not give problems for weeks.
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05-16-2016, 02:44 PM
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#2 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,731
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Re: 85 GMC truck hesitates on hills occasionally
Surely you jest!!
There are no hills in Calgary!! JK!!! Welcome to the jungle!! Could be your fuel pump give early signs of going kaput. Or a filter plugging off. Pull the fuel line off the carb, check the filter inside the carb. Also put the end of the fuel line in a jar and crank it over. A good pump will pump a pint in 15 seconds. |
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05-16-2016, 09:58 PM
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#3 |
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Registered User
Join Date: May 2016
Location: calgary
Posts: 5
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Re: 85 GMC truck hesitates on hills occasionally
Thanks. I replaced filter and opened up the old one and it looked clean. I will try the flow with the jar. I've been told the fuel pump either fails or it works?
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05-17-2016, 09:45 AM
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#4 |
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Registered User
Join Date: Oct 2013
Location: Maine
Posts: 2,375
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Re: 85 GMC truck hesitates on hills occasionally
Fuel pumps can dribble fuel too. It should be checked out. I'm not so sure that would cause a jerk, more of a gradual lack of power. EGR will make a vehicle jerk though.
__________________
76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10 |
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05-18-2016, 12:21 PM
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#5 |
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Registered User
Join Date: May 2016
Location: calgary
Posts: 5
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Re: 85 GMC truck hesitates on hills occasionally
I will replace the fuel pump and see how it is. I have dual fuel tanks. Could a faulty selector valve cause this problem?
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05-18-2016, 12:51 PM
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#6 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,731
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Re: 85 GMC truck hesitates on hills occasionally
Did you test it into a jar first?
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05-19-2016, 12:37 PM
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#7 | |
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Registered User
Join Date: Aug 2011
Location: Tucson Arizona
Posts: 164
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Re: 85 GMC truck hesitates on hills occasionally
Quote:
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05-19-2016, 11:25 PM
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#8 |
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Registered User
Join Date: May 2016
Location: calgary
Posts: 5
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Re: 85 GMC truck hesitates on hills occasionally
Thanks everyone for the advice. I have replaced the fuel pump and will have to road test it.
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05-30-2016, 01:55 PM
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#9 |
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Registered User
Join Date: May 2016
Location: calgary
Posts: 5
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Re: 85 GMC truck hesitates on hills occasionally
Did a test drive around the city going up lots of hills and seems all right. Will do a test drive out to the mountains this week. The dash switch was not always working when switching to the left tank you could not hear the motor or it would be for a short time. I pushed on the connector at the back and the switch broke apart. I replaced the switch but don't know if that was causing any problems.
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