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#45
by
fatmobile
on 24 Oct, 2017 13:41
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What did you use for clear lines?
I use 1/4" stuff and sometimes slide a short piece of 3/8" rubber hose over it before putting it on the barb. I slide this up over the barbed area and if it still leaks I put a hose clamp on the rubber piece.
So occasional air bubble in the line going into the pump while running, right? That could just be some of the air that's stored in the filter. It doesn't go through a diesel soaked paper element very well but sometimes makes it through.
Still a little confused on where the air appears and when. Right after startup? Any air in the lines before startup?
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#46
by
UncleDelicious
on 27 Oct, 2017 21:23
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One of the straps on the fuel tank broke and now the tank has a steady little leak. I think I'll just drain the tank and pull it out to take a better look around that
As for the clear line, it's 5/8" clear fuel line from the auto parts store
The air appears in the lines after running for a hot minute
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#47
by
ORCoaster
on 27 Oct, 2017 22:53
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Wouldn't that be a 5/16" line there?
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#48
by
UncleDelicious
on 28 Oct, 2017 16:31
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Yup, 5/16" not 5/8".
Typographical error, I do not have enormous fuel lines in my engine bay
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#49
by
ORCoaster
on 28 Oct, 2017 20:34
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Kind of what I thought but you never know about these high HP/ Big Boost fellas. They might enjoy that type of input of fuel. The tank would have to be huge to support it but then, you just never know ...
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#50
by
fatmobile
on 31 Oct, 2017 16:38
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Hmmm, 1/4 ID line always works great for me,.. except the MK2s have a smaller barb on the output banjo.
What does a hot minute mean? When you rev it bubbles appear,.. then disappear while reving?
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#51
by
UncleDelicious
on 28 Apr, 2018 16:57
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Winter seems to be over so I'm back trying to get this figured out.
I replaced the fuel tank since my old one was leaking and I'm trying to keep the air out of the system.
I primed the injection pump and did my best to bleed the air out.
The idle is rough and the throttle doesn't do a whole lot. It seems like the fuel isn't coming up through the feed, but it is definitely creeping up the return line from the tank.
I took a video of how it idles and how the throttle is affecting it. You should be able to hear how it sounds in the video
https://www.youtube.com/watch?v=o5C_j6LY1dk
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#52
by
ORCoaster
on 28 Apr, 2018 23:09
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UncleD,
Remind us all since it has been awhile, did you have the pump apart for a rebuild? It almost looks to me like you are not getting the fuel collar to move on the shaft. How about increasing the fuel screw on the top of the pump. Just screw it in about a half a turn then try flipping the throttle, if no results turn in another half turn and try it. Go up to two full turns in, 4 times and you should have tons of fuel being allowed to go in.
Maybe another video of the fourth time trying?
You have to have pressure internally to get it running as it is so that leads me to think it is in the second, high pressure side, just not getting enough.
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#53
by
UncleDelicious
on 29 Apr, 2018 06:57
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I did not have the pump apart.
When I bought the truck I was told the engine was rebuilt, but I do not know for sure and I do not know if that included the pump.
The fuel screw is the horizontal one parallel with the throttle cable?
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#54
by
Dakotakid
on 29 Apr, 2018 11:08
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Check orientation of "in-and-out" bolts/attachments on the fuel supply on pump.
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#55
by
UncleDelicious
on 29 Apr, 2018 13:42
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What is the proper orientation?
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#56
by
ORCoaster
on 29 Apr, 2018 13:53
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Fuel screw is the one with the collar on it just above the four delivery valves on the back of the pump. The pulley end is the front.
If you remove the out bolt you should see a screen like think in the hole when you flip it upside down. The IN bolt has nothing like that, just a straight hole down and one across the provides passage of fuel from the banjo bolt to the inside of the pump.
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#57
by
UncleDelicious
on 29 Apr, 2018 14:52
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Is this the correct screw to adjust?
It was tightened all the way to the collar already. Should I try to remove the collar to tighten it down a turn or 2?
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#58
by
UncleDelicious
on 30 Apr, 2018 21:16
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I played with the fuel screw a little but ended up leaving it where it originally was.
I have figured out that it runs and revs fine while the feed line is still full, but as it continues to run, the fuel in the feed line gets used up and it isn't pulling enough to keep the line full. So it gets emptied out and filled with air while fuel trickles down out of the filter into the IP and it starts running rough and having no throttle response.
My next question here is: how do I get the feed lines to stay full of fuel and continue to remain full? Because it seems if I can keep the fuel flowing well through there it will be back to running and driving again
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#59
by
ORCoaster
on 30 Apr, 2018 23:00
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When was the last time you changed your fuel filter? You might have gunk in the line from the tank to the filter as well. Nothing a little bit of air blown down that line wouldn't help. Just take off the fuel cap first so you don't pressurize the tank.