Fuel Pressure and Hoses

[Gary Derian]

A hose barb fitting is fine if used correctly.  The clamp is never supposed
to go over the barb.  In fact the good barbed fittings (Parker-Hannifin
Push-Lok(R)) use no clamps at all.  They are rated for 250 psi with the
correct hose.  Now if your oil is 300 degrees, you need the ss braid/teflon
tube stuff.

I find the anodized Earls fittings and hose way too expensive.  I use
industrial grade parts from the local hydraulic house.  Steel fittings are
OK for me.

Brass compression fittings are not good for high pressure either.  Use
special flare or flareless fittings to connect to steel tubing.  Best is to
braze the proper AN fitting to the tube.  Make sure all metal pipes are
supported to prevent vibration.

Gary Derian <gderian at oh.verio.com>



> I used the original gm fuel injection hose. Goes from steel flare with o
> ring on tpi to body fuel line. Regular brass flare (-6) fittings work
good.
> Then I used brass compression unions to go to the steel line.  I would not
> use hose barbs at all. Treat it like you would a brake system.  (i.e. all
> threaded /flare fittings).
> Mike Rolica
> Meridian Magnesium Products
> Strathroy, Ont
> Ext. 260
>
>
> -----Original Message-----
> From: Bob Valentine [SMTP:bob at tecmark.com]
> Sent: Monday, November 22, 1999 10:58 PM
> To: gmecm at efi332.eng.ohio-state.edu
> Subject: Fuel Pressure and Hoses
>
> I just picked up a set of 36lb injectors for my Olds 403 project
> since I
> got them at a really good deal.... the thing is, I think they may be
> a bit
> large for my app.  The stock regulator I'm using is set at 39lbs -
> how low
> could I drop it before I run into problems?
>
> Also, what's everyone using for connections of high-pressure hose to
> steel
> line?  Is a standard brass barbed fitting ok?
>
>
> --> Bob Valentine
> --> bob at tecmark.com