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starting problems on 14 liter detroit yet

Nov 30, 2016 at 03:59 PM CST
replaced old spin on filter with new davco replaced injector seals check valve transfer pump on left side on engine. still takes 15 to 20 seconds of cranking to get it to fire if it sits overnight any ideas other than trade off.
Replied on Wed, Nov 30, 2016 at 05:16 PM CST
I had one that gave me a bunch of trouble a few years ago .turned out there was a crack in the Davco filter base put a new filter base on and that fixed it .
Replied on Wed, Nov 30, 2016 at 06:26 PM CST
Good chance your getting air in your fuel system . . why did you take off the spin on? many of those big high dollar filters eventually suck air..i remember racor used to be the big boy on the block.. the rubber orings used to let air in..
Replied on Thu, Dec 01, 2016 at 12:00 AM CST
Davao is worth changing for. Easy to see what's in your fuel, good water separation
easy to change, you can see when it needs changing
easy to prime your engine, electric heater and or heat with
water or hot fuel , probably few more advantages that
I missed, have had several.

Detroit sucking air won't probably start at all.

Losing prime , easiest fix that I found was putting a loop
in return line.
Replied on Thu, Dec 01, 2016 at 12:10 AM CST
And Jeff we had a couple of the old racor , they were a pain
drove over a thousand miles one time to work on truck that
would not run, smeried silcon sealer over all the joints , wires
and any place else on racor filter could get to , got truck running
when we got it home that was the end of the racor,but have very good
luck with Davco,
Replied on Thu, Dec 01, 2016 at 08:11 AM CST
It is loosing its prime when off for a period of time. Check your fuel lines and i can almost bet that you will notice that they are moist from diesel. Another thing is there is a one way valve that does not let fuel drain back to tank that can be bad. It is located right before fuel line runs into head on back side of engine. Good luck.
Replied on Sat, Dec 03, 2016 at 10:30 AM CST
just a loop before the t in the line that goes to the tanks?
Replied on Sat, Dec 03, 2016 at 11:02 AM CST
A loop in the fuel return line , will hold fuel in line between engine and the loop , taking the place of your one way
valve that has probably failed but is very hard to change
on most trucks.

Also sometimes fuel transfer pump slips on shaft , new or not. Lock tight it.