help with 90 benz 500sl

[mercedez500sl]

got 90 benz 500sl
couple things
1. the car has problem starting some times
when warm
have changed fuel filter, fuel distrabutor, injectors
so far but still same
2. the soft top when closing comes up to about half way and stops
doesnt close
any body with any idea please let know
thanks

[BENZ TEK]

Originally Posted by mercedez500sl

got 90 benz 500sl
couple things
1. the car has problem starting some times
when warm
have changed fuel filter, fuel distrabutor, injectors
so far but still same
2. the soft top when closing comes up to about half way and stops
doesnt close
any body with any idea please let know
thanks

More than likely the fuel pump check valves and or fuel pressure accumulator has gone bad. It sounds like the fuel pressure is leaving the fuel distributor and is heading back to the gas tank. As far as the soft top goes it sound like one of the limit switches has gone bad but would need a scanner to confirm.

[mercedez500sl]

cool

going to change both the fuel pumps
hopfully that would get rid of the problem....
see what i dont understand is that when it is cold it starts fine
but when the car is warm
and u try starting it after hour or so it takes few cranks to start????

[BENZ TEK]

Originally Posted by mercedez500sl

cool

going to change both the fuel pumps
hopfully that would get rid of the problem....
see what i dont understand is that when it is cold it starts fine
but when the car is warm
and u try starting it after hour or so it takes few cranks to start????

no no no!! Don't change the fuel pumps. Just change the check valves that screw onto the end on the fuel pumps. Also don't forget the accumulator. Before you go and buy any parts you might want to check to make sure that the fuel distributor is not the cause. You can use a pin light and look down the throttle body for any fuel puddles sitting in the bottom of the intake manifold!!

[zcc]

Originally Posted by BENZ TEK

no no no!! Don't change the fuel pumps. Just change the check valves that screw onto the end on the fuel pumps. Also don't forget the accumulator. Before you go and buy any parts you might want to check to make sure that the fuel distributor is not the cause. You can use a pin light and look down the throttle body for any fuel puddles sitting in the bottom of the intake manifold!!

How to check these valves???

[mercedez500sl]

ok changed the check valves but still hard time to start
any body with any more sugustions
please let know
thanks

[mbdoc]

The fuel accumulator is mounted next to the fuel pump package. That device stores fuel pressure for hot re-starts.

The only real way to see if that is the problem is to connect a fuel pressure guage & see if the pressure bleeds off when you shut the engine off.