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Old 08-01-2011, 04:50 PM   #1 (permalink)
dieseldan723
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Truck losing prime...intermittently



The truck seems fine for daily driving, except for long cranking to start.

I recently towed a 10k lb trailer 2,500 miles. When the truck was run hard it would not start after turning it off. At first I thought it was the fuel filter so I changed it. Then it happened again 2 hrs later. Long story short, I realized that a few quick pumps on the manual primer and it fired right up. Sometimes it would die in 30 seconds but one more round of pumping and it stays lit.

One time however, the truck died while running (trailer in tow). I pulled off the highway after a 1000 mile day (never turned it off all day) and it just stopped running. Employed above priming procedures and it ran fine, until I shut it off again.

The manual primer button never seems to build pressure and STAY hard like it should.

Any ideas? This is frustrating, especially when towing.
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Old 08-01-2011, 05:58 PM   #2 (permalink)
marcusallen
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I experienced the exact same behavior, right down to the towing part. But I remembered replacing the fuel filter about 2 weeks before my last trip and after cranking down the fuel filter (a little more than a quarter turn), it's run without a problem. I hope your issue is that simple.
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Old 08-02-2011, 12:04 AM   #3 (permalink)
dieseldan723
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Quote:
Originally Posted by marcusallen View Post
I experienced the exact same behavior, right down to the towing part. But I remembered replacing the fuel filter about 2 weeks before my last trip and after cranking down the fuel filter (a little more than a quarter turn), it's run without a problem. I hope your issue is that simple.
That was my exact thought too. I only did a 1/4 turn when I installed it, however it didn't seem tight enough. I will try it tightening it a bit more.
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Old 08-02-2011, 01:52 AM   #4 (permalink)
jmendoza
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i had that same problem, the filter wasn't tight enough. make sure the o-ring is not kinked either...good luck
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Old 08-04-2011, 02:06 AM   #5 (permalink)
dieseldan723
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I tightened the filter down a bit more but I still can't get it to stay primed. After 35-40 pushes on the primer bulb it will start to get hard to push, however after about a minute or so, it's soft.

I will try removing the filter, check the top o-ring, and reinstall. This is a bit frustrating.
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Old 08-04-2011, 05:13 AM   #6 (permalink)
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Check for a cracked filter housing. I have changed two so far in 309k miles for exactly that symptom.
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Old 08-04-2011, 08:13 AM   #7 (permalink)
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If you pressurize your tank with compressed air, you should be able to locate the leak fairly easily.
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Old 08-04-2011, 09:03 AM   #8 (permalink)
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An easy way to pressurize the tank is to get a cheap fuel cap, tap it to accept an air fitting, and put about 10 PSI of air on the system. Should make the leak easy to find
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Old 08-05-2011, 02:55 AM   #9 (permalink)
dieseldan723
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Quote:
Originally Posted by blkdmax05 View Post
An easy way to pressurize the tank is to get a cheap fuel cap, tap it to accept an air fitting, and put about 10 PSI of air on the system. Should make the leak easy to find
Cool. I have a 2nd cap that I could use for this. Great idea.

Any ideas where you can get a fitting for this purpose?
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Last edited by dieseldan723; 08-05-2011 at 02:56 AM.
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Old 08-05-2011, 02:59 AM   #10 (permalink)
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Just a regualar old air fitting like what you would have on say an impact, or blow gun, etc... As long as you can "plug" an air line in your good to go.
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