No start after sitting overnight...
Thread Starter
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Senior User
Joined: Apr 2003
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From: Jerseyville,IL
No start after sitting overnight...
I've been fighting this truck for a while. It's an '89 7.3L. It won't start after it sits overnight. It cranks and cranks, sometimes it will finally fire, but usually requires starting fluid.
- In the past year it had new injectors installed.
-The lift pump is good.
-I remove the fuel filter after sitting overnight, and it's completely full of fuel.
-I blocked off the return line from the filter also.
-I bled all the injectors.
Could the orings be bad already? It's been a year since they were put in. It started fine for a few months after that.
- In the past year it had new injectors installed.
-The lift pump is good.
-I remove the fuel filter after sitting overnight, and it's completely full of fuel.
-I blocked off the return line from the filter also.
-I bled all the injectors.
Could the orings be bad already? It's been a year since they were put in. It started fine for a few months after that.
Thread Starter
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Senior User
Joined: Apr 2003
Posts: 415
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From: Jerseyville,IL
I tested all the glow plugs and they were good. Light stays on ample time. I went ahead and changed my orings, caps and return lines today. I'll have to see what it does in the morning.
Senior User
Joined: Feb 2006
Posts: 385
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From: Salem Oregon
You said you replaced the injectors, did you replace the injection pump as well?
New injectors with a higher pressure to crack than older injectors could cause your IP to fail prematurely with the increased strains from higher cracking pressures of the new injectors.
New injectors with a higher pressure to crack than older injectors could cause your IP to fail prematurely with the increased strains from higher cracking pressures of the new injectors.
Post Fiend
Joined: Nov 2005
Posts: 7,437
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From: Charles Town, W bygod Va
Watch the tailpipe for smoke while you crank it. That should point you in the right direction.
New User
Joined: Oct 2010
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I have an 86 that does the samething. When I first turn it over after 3 or 4 seconds it will fire up and instantly die even if I have the pedal to the floor. And puffs out a lot of while smoke. Then I usually run the batteries dead trying to get to crank.
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From: western washington
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i ain't rite
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From: Marlboro Mental Hospital.
your problem is air intrusion . you need to replace the return lines, caps, and o-rings.
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Thread Starter
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Senior User
Joined: Apr 2003
Posts: 415
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From: Jerseyville,IL
I replaced the return lines, caps and orings, still no start this morning after I run it a good hour yesterday after replacing them. I'm going to have to look up and see if the injection pump was replaced with the injectors. Seems to me like he sent it in for a different one when he changed injectors. Is there a way to check the injection pump, or do I have to take it off and have it checked? Once the truck is running it seems to have more get up and go than my '97 and '00 powerstrokes. I may try plugging it in tomorrow night, It's been 100 degrees here, I wouldn't think it would need glow plugs to start. When I plugged off the filter return line, I cranked it over before I plugged it. Fuel immediately came spraying out, so I would think the lift pump is fine, and that there's no drainback in the filter, I took the filter off prior to verify and it was completely full.
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Senior User
Joined: Apr 2003
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From: Jerseyville,IL
Okay, I ran the clear line test again after changing all my return fittings. I am getting some bubble coming from the return from the filter housing to the #1 injector. Also, the line from the #8 injector to the T never fills with fuel. I also have a clear line in place of the rubber line coming from the tank to the lift pump. There are no bubbles there. There are also no bubbles in the injection pump return line. I'm thinking this is pointing me to a leak in the filter head? What orings are inside, and what do I need to seal up the connections? Also, is there any check valves in there that I can replace?
After the truck has sat a bit, there is a large bubble in the injector return line, and also a big bubble in the return from the filter line. The line going to the lift pump remains full.
After the truck has sat a bit, there is a large bubble in the injector return line, and also a big bubble in the return from the filter line. The line going to the lift pump remains full.