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10-10-2010, 03:29 AM
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#1 |
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Registered User
Join Date: Apr 2009
Location: Tucson, AZ
Posts: 184
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fluctuating fuel flow
wondering what could cause this i have a clear fuel filter and sometimes its full sometimes its half or below full and other times its spitting is my fuel pump going out? The fuel pressure gauge i had on the fuel line between the carb and the filter went out recently but last time i checked the pressure on it it would jump up and down as well. any ideas what could cause this?
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10-10-2010, 11:13 AM
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#2 |
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Robert Olson Transport
 
Join Date: Oct 2002
Location: recent transplant to NC USA
Posts: 20,313
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Re: fluctuating fuel flow
on the 77 i assume you have a mechanical pump..it could have an issue with the diaphram in it or there could be an issue with junk blocking flow by the sock in your tank.. is this at idle?
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Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! |
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10-10-2010, 12:57 PM
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#3 |
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Registered User
Join Date: Apr 2009
Location: Tucson, AZ
Posts: 184
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Re: fluctuating fuel flow
yea its at idle. i have noticed that sometimes it just doesn't run as well as other times kinda feels a little bogged down
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10-11-2010, 12:34 PM
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#4 |
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Registered User
Join Date: Apr 2009
Location: Tucson, AZ
Posts: 184
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Re: fluctuating fuel flow
anybody have an issue like this before?
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10-11-2010, 07:29 PM
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#5 |
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Registered User
Join Date: Jan 2007
Location: High Desert
Posts: 5
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Re: fluctuating fuel flow
Big block or small block ? How old is the fuel pump ? and is your fuel cap vented or closed ? I pulled the socks out of my 76 GMC (dual tank) and they were nasty dirty.
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10-13-2010, 01:19 AM
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#6 |
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Registered User
Join Date: Apr 2009
Location: Tucson, AZ
Posts: 184
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Re: fluctuating fuel flow
Small Block, bout 3 or 4 years old, both saddles are vented only use one think that selector valve is busted stalls out if i switch it over, and i dont know what you mean by socks never dealt with the tanks before...
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10-13-2010, 01:29 AM
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#7 |
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Registered User
Join Date: Dec 2009
Location: Fairbanks, AK
Posts: 1,830
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Re: fluctuating fuel flow
Had a similar issue - it was very intermittent though and I never corrected it. I always suspected the fuel pump diaphram. Both tanks were vented and vents worked well (never any pressure when removing the cap). All the lines and connections were good. I'd start there - it's a pretty cheap part.
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-Marcus 1991 V3500 L29 454 4L80E NP205 D60/14 Bolt 4.56's 1984 K30 292 TH400 NP205 D60/14 Bolt 4.56's flat bed 7'6" Meyer Plow 2022 Silverado 3500 L8T Project Daily Driver Project Heavy Hauler Project Plow Truck |
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10-14-2010, 10:31 PM
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#8 |
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Registered User
Join Date: Apr 2009
Location: Tucson, AZ
Posts: 184
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Re: fluctuating fuel flow
so think i should just replace the whole pump?
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