[DML] Re: Fuel pressure question
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[DML] Re: Fuel pressure question



Like many problems on a 25 year old car, this can be the culmination
of many small things. How old are the spark plugs and what are they
gapped at? Are you getting a good pattern out of the fuel injectors?
Have you ever cleaned out the fuel tank? Replaced the fuel or air
filters? If the accumulator is origional it should be replaced just
because it IS 25 years old. Is there anything in the hot start relay
plug? There shouldn't be. The pressures are to be checked with the
motor NOT running, just the fuel pump (refer to D:02:02). The Primary
Pressure is a touch low but should not be a problem. The Control
Pressure sounds OK if the temperature of the Control Pressure
Regulator is around 104 F or higher (as per Fig 17 on D:02:01. The
Rest Pressure is NG. Your choices are the accumulator, the fuel pump
check valve, and the Primary Pressure Regulator (or a leak which is
VERY dangerous). I am guessing but the Primary Pressure and the
Control Pressure are probably alright if you read them with the motor
off and the fuel pump running. Look at Fig 4 D:01:06. It shows the
Primary Pressure circuit. When you shut the motor down it is where the
Rest Pressure is held and maintained by the accumulator. It can be
lost through:
the fuel pump check valve
the accumulator
the Primary Pressure regulator
Any leakage in the plumbing and connections between (also leaky
injectors, cold start valve, sticky plunger). 
Read D:01:14



--- In dmcnews@xxxxxxxxxxxxxxx, "usndmc" <usndmc@...> wrote:
>
> Hello all,
> 
> I have had a hot start problem for a little while now. The car 
> starts okay when cold, although sometimes it takes 4 or 5 seconds, 
> or even cranking it a second time. If it's been sitting for anywhere 
> from around 20 minutes to an hour and a half after running, I 
> usually have to crank it a few times, wait a minute or two, and 
> crank it about 5 more times for it to start. I got my hands on a 
> pressure tester today, although I'm not sure if I used it correctly. 
>







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