Re: No Fuel to injectors

["David Teitelbaum" <jtrealty@xxxx>]

In a static situation in a pressurized system the pressure is equal in
all parts of the system. Under flow conditions restrictions start to
have importance. For the purposes of the fuel injection system in the
Delorean you can assume that unless you have a kink in a hose or a
plugged valve that the pressure you read is the pressure in that part
of the fuel system. The size of the hose has no effect on the fuel
pressure once the system has filled and pressurized. The fuel pump has
EVERYTHING to do with the pressure in the system as well as the
pressure regulating valves. You are correct that you need a certain
minimum pressure before you get the injectors to open and start
spraying. As long as fuel is getting to the injectors there is only 1
reason they won't spray, not enough presssure. There can be 2 causes
for not enough pressure, the pump can't make enough pressure and a
pressure valve is letting the pressure out, back to the fuel tank.
Messing with the mixture screw will not get the injectors to open at a
lower pressure and you will just loose that critical adjustment. 
Start in the gas tank and make sure the fuel pump isn't sucking in
any air and the pick-up hose isn't kinked. The fuel system is
hydraulic, not pnuematic so if there is air getting in it won't work.
David Teitelbaum
vin 10757 


--- In dmcnews@xxxxxxxxxxxxxxx, "content22207" <brobertson@xxxx> wrote:
> You didn't by chance replace the small diameter line from accumulator
> to filter with something larger? That small diameter line is what
> creates high fuel pressure, not the pump itself (is not 75 PSI from
> the tank). Kind of like putting your finger over end of a garden hose.
> 
> See Message #32067. Sounds definitely as though you aren't "cracking"
> the fuel injectors. Need minimum 50-51 PSI to start spraying. If
> you're SURE everything from fuel distributor forward is factory spec,
> may need to adjust fuel mixture screw. You may not have touched, but
> are you sure no one else has? Note fuel mixture is set with car
> running -- NO VACUUM LEAKS! If you've got an injector out, plug its
> port in head -- 1/4" vacuum leak otherwise. Make sure line feeding
> idle speed motor from under fuel distributor is tight -- 3/4" vacuum
leak.
> 
>