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Discussion Starter · #1 ·
Tried searching to no avail. When you remove the J-Tube do you just connect the two fuel lines back together?

Any negative side effects to consider?

M
 

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Registered
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3,727 Posts
thought you would want to remove it if you bought a bigger fuel pump?
 
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Discussion Starter · #7 ·
you would be amazed at the size of the restriction it is.i just pulled mine the other night and i don't think i could fit a needle through that thing.
 

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I heart 80's Toyota's
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631 Posts
i don't think the j tube will affect stock fuel pressure... its a failsafe incase the factory reg shits out
 
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Discussion Starter · #10 ·
browning said:
you would be amazed at the size of the restriction it is.i just pulled mine the other night and i don't think i could fit a needle through that thing.
Yeah - I was very surprised to see the restriction was maybe a 1/16th" hole.

If the J-tube is removed will the stock regulator still hold the pressure where it should be?

Another sputid question :doh: . . . Why is there a hole in the block behind the J-tube? Does it have some function?
 

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Just some guy
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1,682 Posts
Thats where the mechanical fuel pump bolts to on the old M series motors. The oil pump driveshaft had a lobe to drive the pump. In fact, the 5mge driveshaft still has the lobe on it. The 7m finally got rid of it.
 
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