12 Valve Engine and Drivetrain Talk about the 12V engine and drivetrain here. This is for 1994-1998.5 engine and drivetrain discussion only.

primer pump

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Old 04-18-2004, 05:50 PM
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primer pump

high all just got a 98 ctd auto a couple a weeks ago love the truck lots of power. My question is this it seems to crank more than my dads 95 ctd to start unless i give it a little push on the throttle while starting then it fires right up so i figured i'd change the fuel filter canister style , while priming it i heard what sounded like an air leak is it just a bleader or should i be looking for a broken line somewhere? thanks for any help
Old 04-18-2004, 07:26 PM
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I get that too, when I don't open the bleeder bolt, I can't trace where it is coming from, it sounds like it's from the injection pump. I am wondering about this, too.
Old 04-18-2004, 10:06 PM
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RCW
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The most common cause of the need to press the throttle a bit to get a 12 valve started is slipped timing.

The noise you hear when you are priming is the overflow valve flowing excess fuel back to the tank, and is normal. If the valve keeps flowing after you quit priming, pull the small plug from the center of it and check the spring and follower to be sure they are not broken. That can cause hard starting too.

On the 94 make sure you have a two piece overflow valve. If you still have the one piece OEM valve, replace it.
Old 04-19-2004, 10:32 AM
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Originally posted by RCW


On the 94 make sure you have a two piece overflow valve. If you still have the one piece OEM valve, replace it.
The new style OF valves are all one piece.

The hiss you hear when priming with the bleed bolt closed is the air/fuel going though the OF valve.

Your idle may be set too low if you need to push down on the throttle while starting.
Old 04-19-2004, 06:54 PM
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I had the same problem starting as you. Adjusted the valves and kicked timing to 16.5 and the thing starts and runs like a bear.
Old 04-26-2004, 09:30 AM
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thanks for all the info guys been real busy at work so took a while to get back but i adjusted the idle a tad and all is good now
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