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Discussion Starter #1
I have had fuel problems since i bought this truck. My question is: today i installed a holley red pump on the feed side of the fuel lines close to the tank. I have bypassed the selctor valve and i am only using front tank. The filter bowl doesnt seem to be staying full. I have not removed the mechanical full pump yet. It isnt leaking. Just wasnt pulling hard anymore it seems. Wen i turn on the electric pump the filter bowl fills with diesel wen truck isnt running. It is a very small solid stream of guel pumping into filter bowl. A stream no bigger than a pencil lead. My question is, could the mechanical pump be restricting flow and if so how do i remove it. I see 5 lines connected to the pump. One going under the filter housing, two steel lines going to the back of the heads and two line on top of the pump with ruber hose going to two stainless steel lines which seem to run back to the tank. What are all these lines and how do i bypass them? I have read about the block out plate but cant find anything about these fuel lines. Also. The little thing on the side of the filter housings with all the fuel lines coming into it. It also feed the filter bowl with fuel. What is that called and does it have a rebuild kit or diaframs inside of it that get clogged. Any suggestions help because i am lost at what to do. System is sealed everywhere. I checked everything for leaks.
 

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psn high miler
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96 Posts
A) quit hanging with dodge guys
B) take that chit to the chop
C) replace your pickup tube like i told u yesterday
And replace all the parts you've misplaced

Thanks and have a blessed day!
 

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crazed & deranged farmer
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The stock fuel system on an OBS such as yours has a two stage mechanical fuel pump. It sucks fuel from the tanks, then feeds it to the fuel bowl, then back to the pump pressurized to the back of the heads. from there it feeds the injectors and at the front of the heads has 2 return lines that go to the fuel bowl where the pressure is regulated then the fuel is returned to the fuel tanks.

By putting the holly fuel pump to feed the fuel pump it wont necessarly fix your problem. As for removing all the lines, you can do this but i dont think that holley red fuel pump will be enough to support the proper fuel pressure. Look for posts on a Regulated Return Fuel System, this will help you convert the truck to E-Fuel and eliminate the mechanical pump and the fuel bowl.
 

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Discussion Starter #6
Haha. Yeah i'll have to remember that next time. Nastyf250 u own a 6.0 i feel ur pain. Any real suggestion on my fuel problem?
 

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Discussion Starter #8
Ok thanks i'll try to look that up. Yeah it really seem like the holley isnt strong enough to push all the way to the injectors.
 

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If your fuel pump is dead, installing a pump downstream of it wont help. The fuel pump in your truck is a dual purpose fuel pump. It has a low pressure side that draws fuel through the tank, and a high pressure side that pushes the fuel through the filter and then to the injectors (with the excess fuel going back to the tank past he fuel pressure regulator). The best case senerio with a pump between the tank and the factory pump is helping a weak pump function. It woiuld not help a failed pump in any way or make the problem go away (assuming fuel pressure is actually your problem).
 

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crazed & deranged farmer
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Ok thanks i'll try to look that up. Yeah it really seem like the holley isnt strong enough to push all the way to the injectors.
Just to give you an idea of the kind of pressure you need for larger injectors, My truck runs at 65psi to the injectors at idle.
 

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Discussion Starter #11
Ok. If i replace the pump. I read there was something to worry about, falling into engine? Is the mechanical pump easy to replace or dangerous? And will the pump fail without weeping or leaking into oil?
 

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Discussion Starter #12
I have been scared to change pump because i dont want to ruin the engine if i drop something in it that shouldnt be.
 

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Haha. Yeah i'll have to remember that next time. Nastyf250 u own a 6.0 i feel ur pain. Any real suggestion on my fuel problem?
Im no moderator on this forum, nor do i carry any weight around here....But being an @%* to someone who seems to have the right idea on ways to help you is not the way to go........Especially when putting a fuel pump on a truck in a way that wont help it function was your answer. Just my two cents.......

And just for the record......Most 6.0 or 6.4 owners on these forums have owned or had pretty good experience with late model and OBS 7.3's......so just because he owns a 6.0 now, dont assume he doesnt know 7.3's as well.

I dont own a diesel at all.....So i guess by your statement above i dont know anything so you can disregard my post.:blah:
 

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crazed & deranged farmer
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Ok. If i replace the pump. I read there was something to worry about, falling into engine? Is the mechanical pump easy to replace or dangerous? And will the pump fail without weeping or leaking into oil?
Yes, there is a pushrod that rides on the cam. DO NOT DROP IT INTO THE MOTOR! the pump can be hard to pull out of the block if its been in for a long time. And yes a pump can fail and not seep or leak fuel to the outside of the engine or then oil system, but if you notice your oil level come up you have problems.
 

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Discussion Starter #15
Nastyf250 has been my good friend for over 10yrs. My post fell in behind yours but was not intended to u. He was just messing with me so i messed with him a lil too. Our other buddy drives a dodge. Just some inside joking. Sorry bout that.
 

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Nastyf250 has been my good friend for over 10yrs. My post fell in behind yours but was not intended to u. He was just messing with me so i messed with him a lil too. Our other buddy drives a dodge. Just some inside joking. Sorry bout that.
LMAO..Well then i appologize for getting offended......Thats not what it looked like from my end.....It looked like someone offering advice and then getting the middle finger waved at them:poke: IMO even bad advice is worth considering if your to the point that your on a forum asking questions (beyond your knowledge/experience level in other words).

anyway....back to your regularly scheduled program them!!!:D
 

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crazed & deranged farmer
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Nutfarmer. My oil pressure is running at normal when i have been able to get it running for a minute or two
I didn't say oil pressure, I said level. As in checking the dipstick... if you engine "makes oil" then you have fuel leaking into the oil system.
 

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Discussion Starter #20
Wen i remove the pump. How do i keep the push rod from falling in the motor? Magnet or something. Partially pull out pump then grab push rod with needle nose?
 
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