Re: Gas Lines From Fuel Pump

["Dave Swingle" <dswingle@xxxx>]

--- In dmcnews@xxxxxxxxxxx, "Scot Stern" <SGSKBM@xxxx> wrote:
> My original gas lines were leaking. . . .
> 
> Anyway, I replaced the line with ones that I bought at Auto Zone 
and 
>The presure cannot be that great in the system. . .

Au contraire!! The pressure is VERY high in the system - 80 PSI on 
the high side according to the DMC tech manual. The fuel pump 
pressure is used to open the injectors in this mechanical system. It 
takes about 50 PSI to "pop" the injector open. The return line 
pressure is lower, maybe 45 PSI. In fact the spec for pressure 10 
minutes after shutoff is still 25 psi (accumulator test!). 

The original hoses are teflon hose, covered with a nylon braid (like 
the stainless braid on your clutch line) and then a rubber outer 
cover. This is designed as high-pressure, fuel-tolerant hose. Modern 
injected cars with electronic injection systems do not use such high 
pressure since the injectors are opened electronically rather than by 
pressure. 

There are "generic" (for example Aeroquip-brand) equivalents for this 
hose, but however you buy it, it is not cheap hose. If you just 
bought regular gas line like you'd put on a carbureted Ford, it is 
designed to take maybe 10 PSI. If you get it from the DMC places it 
will be the right stuff. 

Dave Swingle