mystery valve on 6.5l td
#1
mystery valve on 6.5l td
hey guys. I have a valve on top of my engine located next to the alternator. its a screw in and out on/off valve. it has two hoses. one just hangs off the driver side of engine and the other goes under the intake. I turned it off while m truck was running and it died. so what does this valve do cause I opened it back up and she still wont start. the filter housing runs out of fuel but Ive already put 5 gallons throught the housing and as soon as it runs out she dies. any ideas?
#5
Join Date: Oct 2012
Location: Scugog Island ONT.
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The oil pressure switch powers the lift pump when the engine runs and the LP relay powers it when the key is turned to crank-so it would seem that your OPS is bad(provided the LP works when cranking)and that is a common problem.
For a test open the filter bleed screw,then put the truck in drive and turn the key to crank watching through the open hood-fuel should jump out the filter bleed when the key is turned.
If so the LP is ok and OPS needs replaced likely-AC Delco ONLY for replacement because parts store OPS are often bad right out of the box.
Google "OPS relay mod" and install for long tern reliability.
For a test open the filter bleed screw,then put the truck in drive and turn the key to crank watching through the open hood-fuel should jump out the filter bleed when the key is turned.
If so the LP is ok and OPS needs replaced likely-AC Delco ONLY for replacement because parts store OPS are often bad right out of the box.
Google "OPS relay mod" and install for long tern reliability.
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