|
02-18-2017, 03:45 PM
|
#1 |
|
Registered User
 
Join Date: Jul 2010
Location: mogadore ohio
Posts: 867
|
Tank selector valves
Are tank selector valves known to go bad? I seem to have a fuel flow problem. I installed a new pump and checked all of my lines but sometimes at random my truck will start to Surge. I have a clear fuel filter installed and I've noticed that the fuel just seems to trickle inside the fuel filter. My truck has auxiliary fuel tanks on each side I was wondering if the fuel tank selector valve is known to go bad and maybe I could be sucking air
__________________
1969 chevy c10 lwb stepside 250 6 3 ott 1971 chevy c10 lwb 250 6 with power steering 3 ott 1972 chevy k20 4x4 350/TH350 automatic 1978 chevy Malibu 4dr 305 2bbl (all original) 1979 chevy k10 Scottsdale 350/th350 full-time 4wd(daily driver) |
|
|
|
02-18-2017, 04:33 PM
|
#2 |
|
Registered User
Join Date: Nov 2014
Location: Bigfork, Montana
Posts: 1,137
|
Re: Tank selector valves
The only issue I've ever had is they start to leak fuel. I have one now that weeps when changing tanks then stops. I would think that trash (rust) int the tanks or a bad fuel pump before the selector valve. what's the fuel in your filter look like? Does it flow better on the main tank?
|
|
|
|
|
02-18-2017, 04:36 PM
|
#3 |
|
Registered User
Join Date: Jul 2010
Location: mogadore ohio
Posts: 867
|
Re: Tank selector valves
I only use main tank and it's been cleaned along with line. Auxiliary tanks I've never used. Fuel in filter is clean as can be. New pump is an ac delco
__________________
1969 chevy c10 lwb stepside 250 6 3 ott 1971 chevy c10 lwb 250 6 with power steering 3 ott 1972 chevy k20 4x4 350/TH350 automatic 1978 chevy Malibu 4dr 305 2bbl (all original) 1979 chevy k10 Scottsdale 350/th350 full-time 4wd(daily driver) |
|
|
|
|
02-18-2017, 04:38 PM
|
#4 |
|
Registered User
Join Date: Nov 2014
Location: Bigfork, Montana
Posts: 1,137
|
Re: Tank selector valves
Gotcha, you can by-pass pretty easy. Might be worth a try.
|
|
|
|
|
02-18-2017, 04:38 PM
|
#5 |
|
Senior Member
Join Date: Oct 2009
Location: Godley, TX
Posts: 17,937
|
Re: Tank selector valves
The worst that usually happens is that they freeze in a position and you can't select the other tank or they leak - but I doubt it is related to a surge. Sounds more like a carb issue to me. If it runs normal and the filter looks the same as when it surges, I doubt there is an issue with the fuel getting to the carb. Might be worth looking at the carb. I'd also check for leaking vac lines to the distributor. When does the surging occur? Under accel load? Idle? Part throttle cruise, etc?
|
|
|
|
|
02-18-2017, 04:40 PM
|
#6 |
|
Registered User
Join Date: Jul 2010
Location: mogadore ohio
Posts: 867
|
Re: Tank selector valves
Carb has been rebuilt. Fuel doesn't fill the clear filter like it should barley trickles in sometimes and then sometimes is fine.
__________________
1969 chevy c10 lwb stepside 250 6 3 ott 1971 chevy c10 lwb 250 6 with power steering 3 ott 1972 chevy k20 4x4 350/TH350 automatic 1978 chevy Malibu 4dr 305 2bbl (all original) 1979 chevy k10 Scottsdale 350/th350 full-time 4wd(daily driver) |
|
|
|
|
02-18-2017, 10:15 PM
|
#7 |
|
All about them K’s
 
Join Date: Jun 2014
Location: Farmington, New Mexico
Posts: 6,265
|
Re: Tank selector valves
Is your tank venting?
__________________
Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 315/75/16's ‘87 IROC-Z all original 50K mile survivor TPI 305 IROC Blue ‘10 Camaro 2SS/RS Aqua Blue Metallic #93 -version 2.0 
|
|
|
|
|
02-18-2017, 10:16 PM
|
#8 |
|
Registered User
Join Date: Dec 2007
Location: Santa Maria, Ca.
Posts: 1,423
|
Re: Tank selector valves
I had a 65 dump truck with the three way valve and it sat a year or two. Varnish built up in the lines and when I started driving it again some of the varnish broke loose and partially blocked the valve. Truck would run fine until I hit a hill and would not get enough fuel. If you still have the old lines from the tanks to the valve I would take them loose and make sure they are clean
__________________
69 Chevy 4x4 383 Power 
|
|
|
|
|
02-18-2017, 10:19 PM
|
#9 | |
|
Registered User
Join Date: Jul 2010
Location: mogadore ohio
Posts: 867
|
Re: Tank selector valves
Quote:
__________________
1969 chevy c10 lwb stepside 250 6 3 ott 1971 chevy c10 lwb 250 6 with power steering 3 ott 1972 chevy k20 4x4 350/TH350 automatic 1978 chevy Malibu 4dr 305 2bbl (all original) 1979 chevy k10 Scottsdale 350/th350 full-time 4wd(daily driver) |
|
|
|
|
 |
| Bookmarks |
|
|
Linear Mode
