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Why Does This Hose Keep Blowing Off? *pic*

hazerb30

By hazerb30,
in Engines & Forced Induction

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hazerb30 Collaborator

hazerb30

Posted
Posted (edited)

Found this little hose had come off. Fixed the high idle problem ive been having :thumbsup: See attached pic

But today it came off again. Its obviously a vacuum hose going to the fuel pressure reg but i didnt realise just how important it is until i did some reading on here.

This from sydneykid was most enlightening.. and scary

Sydneykid on FPR hose/boost guage install

There is no clamps on this little hose and no evidence there ever were so it makes me think nissan never expected it to come off. Its coming off when the car is on boost.

Anyone know why? i dont want to just clamp the thing on id rather understand whats happening because it could be pointing to something more serious?

Car is R32 gtr, 1989, 1.0 bar boost, stock computer, aftermarket turbos recently installed which were rebuilt and highflowed r33's.

post-7752-1247141975_thumb.jpg

Edited by hazerb30
Duncan Grand Master

Duncan

Posted
Posted

most likely there is a small split in one end of the hose, so replace it. Mine is on and off regularly (with every motor) so I cable tie it each time. Never had a problem since (and despite Gary's disagreement I run my boost controller from there)

James_03 Mentor

James_03

Posted
Posted

I replaced myn a while ago with some good turbosmart vac line then cable tied it. Just make sure the replacement hose is the same ID.

I would recommend silicone hose for replacement over rubber too. I also never T anything off the reg line as gary mentions.

Brezza Proficient

Brezza

Posted
Posted

i had the same problem,

replaced the hose as its cheap as, mine had dried up and was a stretched from being on the car for 20 years.

FYI mine is a '89 R32 GTR too.

replaced the hose, cable tied it and it hasnt popped off since.

easy fix!

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      Yup. You can get creative and make a sort of "bracket" with cable ties. Put 2 around the sender with a third passing underneath them strapped down against the sender. Then that third one is able to be passed through some hole at right angles to the orientation of the sender. Or some variation on the theme. Yes.... ummm, with caveats? I mean, the sender is BSP and you would likely have AN stuff on the hose, so yes, there would be the adapter you mention. But the block end will either be 1/8 NPT if that thread is still OK in there, or you can drill and tap it out to 1/4 BSP or NPT and use appropriate adapter there. As it stands, your mention of 1/8 BSPT male seems... wrong for the 1/8 NPT female it has to go into. The hose will be better, because even with the bush, the mass of the sender will be "hanging" off a hard threaded connection and will add some stress/strain to that. It might fail in the future. The hose eliminates almost all such risk - but adds in several more threaded connections to leak from! It really should be tapered, but it looks very long in that photo with no taper visible. If you have it in hand you should be able to see if it tapered or not. There technically is no possibility of a mechanical seal with a parallel male in a parallel female, so it is hard to believe that it is parallel male, but weirder things have happened. Maybe it's meant to seat on some surface when screwed in on the original installation? Anyway, at that thread size, parallel in parallel, with tape and goop, will seal just fine.
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      I wouldn't worry about dissimilar metal corrosion, should you just buy/make a steel replacement. There will be thread tape and sealant compound between the metals. The few little spots where they touch each other will be deep inside the joint, unable to get wet. And the alloy block is much much larger than a small steel fitting, so there is plenty of "sacrificial" capacity there. Any bush you put in there will be dissimilar anyway. Either steel or brass. Maybe stainless. All of them are different to the other parts in the chain. But what I said above still applies.
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