[DML] Re: won't start low primary pressure
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[DML] Re: won't start low primary pressure



Low primary pressure is caused by one or more of the following:
a problem with the pick-up hose (kinked or perforated)
a plugged up/dirty pick-up filter and too much water or dirt in the tank
A plugged up fuel filter
bad fuel pump
stuck primary pressure regulator
no fuel in the tank
bad accumulator
I would start in the fuel tank. Pull the pump and see if there is any
dirt in there and the condition of the pick-up hose and filter. Since
the system does hold some pressure the accumulator and pressure
regulator are probably alright.
David Teitelbaum
vin 10757 



--- In dmcnews@xxxxxxxxxxxxxxx, "scberridge" <scberridge2@xxxx> wrote:
> My car has always started very easily.  For the past year tho
> it has started to starve (or load up?) after running about 5 minutes.
> Once it got thru that period - usually by letting it sit for a few
> minutes - it ran fine.
> 
> Then one day about 20 minutes into a drive, it died turning a corner
> and would not start.  Towed her home and have been checking things
> over.
> 
> Finally got a fuel pressure gauge last night and find the following.
> connecting the gauges as per fig. 18 D:02:02 (between the fuel
> distributor and the control pressure regulator) if find:
> crank the engine and the fuel pressure comes up to 2.9bar (~42psi)
> the specs say the primary pressure should be 4.9-5.5bar, so
> mine it quite low.
> I also note that removing the RPM relay and jumpering terminal 87
> to 30 did NOT run the pump (key on), altho I do hear the pump run
> either before or just after cranking - key on.  And the pump is
> clearly working at some level.
> Specs also say injectors open at 3.5 to 4.1bar - so clearly that's
> a problem.
> 
> I have done the hot start trick, of putting the gray connector onto
> the cold start valve - no joy.  Not even a bit of fire.
> I've checked the spark, by pulling the plugs one by one and it seems
> ok - surely enough to fire - even if it's not perfect. Eyeballing this
> is a poor test.
> I can smell gas fumes in the tail pipes so something is getting there,
> but maybe not enuf.
> 
> The system held pressure overnight, only dropping to 2.55bar.
> 
> Anyone know what causes low primary pressure, while being able to 
> hold pressure overnight?  Also, I've seen no evidence of leaks.
> Thanks very much,
> Steve






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