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-   -   help with 90 benz 500sl (http://www.peachparts.com/shopforum/mercedes-benz-sl-discussion-forum/195227-help-90-benz-500sl.html)

mercedez500sl 07-25-2007 08:03 PM

help with 90 benz 500sl
 
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 07-25-2007 09:07 PM

Quote:

Originally Posted by mercedez500sl (Post 1573363)
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 07-26-2007 01:25 AM

ok
 
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 07-27-2007 03:25 PM

Quote:

Originally Posted by mercedez500sl (Post 1573654)
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 07-27-2007 05:48 PM

Quote:

Originally Posted by BENZ TEK (Post 1575326)
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 07-31-2007 09:33 PM

re: 500sl
 
ok changed the check valves but still hard time to start
any body with any more sugustions
please let know
thanks

mbdoc 08-01-2007 08:27 AM

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.


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