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Old 12-23-2011, 04:59 PM   #1 (permalink)
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93 12v with no power

Hi I am having a issue with my 12v. I pulled the pump apart to do the fuel pin mod and to tighten down the star and lost one of the copper washers. So i tried another washer and am still having low end torque issues due to low boost. Is all this loss from the washer missing or could I have tightened the star too much or something else I have done wrong. And if it is the washer where could I get a set?
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Old 12-23-2011, 05:48 PM   #2 (permalink)
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What kind of a mod did you do on the fuel pin? If you just rotated it and turned the starwheel down that shouldn't have caused any problems. The washer is a cummins item, you'll have to give them your engine S/N and CPL number off the tag on the timing cover.
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Old 12-23-2011, 05:58 PM   #3 (permalink)
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i bought the truck used and it already had a fuel pin in it so i did a full turn on the star wheel. i noticed that it lost power so i opened it back up and i turned the star wheel back to where it was. i have a boost gauge and it used to read around 25 now it barely gets to ten.
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Old 12-23-2011, 07:46 PM   #4 (permalink)
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no other washers will work? like the one i had put on there was a metal washer. do you think i could go up to napa and see if they have a copper washer close to that or even would even a nylon washer work?
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Old 12-23-2011, 07:56 PM   #5 (permalink)
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A nylon or rubber one from a old car tire tube may get you by.
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Old 12-23-2011, 08:12 PM   #6 (permalink)
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hopefully i will stop by napa in the morning when i get off duty. but do you think that is what my issue is? just that vacuum leak isnt allowing boot to push that diaphragm down in the pump to allow more fuel. also i noticed that i have no take off power is that caused by that also?
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Old 12-23-2011, 08:25 PM   #7 (permalink)
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From what I hear you can run without that boost line, there was a thread this week about a broken banjo bolt on that piece you might check that thread. You could put some soapy water on it to see how bad it leaks.
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Old 12-23-2011, 09:01 PM   #8 (permalink)
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thanks for the help. i searched for that thread you were talking about and found a napa parts list that fixes that.
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Old 12-24-2011, 09:45 AM   #9 (permalink)
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You can drive without the boost line I've had to. It just keeps the fuel pin from pushing down so less fuel. Kind of like having a valet switch on constantly.
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Old 12-24-2011, 11:50 AM   #10 (permalink)
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well i went up to napa and they said they didnt have the parts. so i tried finding a different copper washer still no luck. guess it will have to wait till after the holidays. would not having this line on cause no boost?
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Old 12-24-2011, 03:58 PM   #11 (permalink)
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As long as the line is capped on the engine your boost should be same as before. You can get those fittings at a hardware store just make sure it has a insert that goes inside the tube.
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Old 12-24-2011, 04:16 PM   #12 (permalink)
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its not. my guage is only reading max of ten PSI it used to go up to right under thirty. do you think i really messed something up by turning that star wheel?
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