Author Topic: help guys my car won't start  (Read 4287 times)

erickmarciano

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help guys my car won't start
« on: May 05, 2011, 23:31:54 »
Hi all
here is what I did;
filled up my gas to full. drove for about 10 min than stopped for 10 min than the car was real hard to start.onec started it run fine till home.once home I gave it a quick lookafter<oil the distributor> adjust the linkage<only a little at the venturi it was sticking a little.
now the car will not start.
1-got spark
2-got fuel coming into the injection pump<it disconected the line going to the injection pump.
3- there is very little fuel comming from the return of the injection pump.I can actually hold my finger there and there is not much pressure...is this normal
Thanks for all your help
Erick
1994 E500 W124
1971 280sl
1989 Porsche 930 coupe
1988 e30 m3
2001 ducati mh900
2006 ps1000
1962 Vespa GS160

dseretakis

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Re: help guys my car won't start
« Reply #1 on: May 06, 2011, 00:08:42 »
If I'm correct there should be 1L per 15 seconds coming from return line. It appears as if you have low pressure and possibly low volume.

erickmarciano

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Re: help guys my car won't start
« Reply #2 on: May 06, 2011, 00:29:33 »
why would there be fuel coming in but not out of the injection pump?
1994 E500 W124
1971 280sl
1989 Porsche 930 coupe
1988 e30 m3
2001 ducati mh900
2006 ps1000
1962 Vespa GS160

dseretakis

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Re: help guys my car won't start
« Reply #3 on: May 06, 2011, 00:51:15 »
I don't want to give more advice than my amateur knowledge allows me but it is my understanding that the volume/pressure test is done at the point where the fuel exits the injection pump to the return line.  Also, you might want to check to see if your cold start valve is leaking.

erickmarciano

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Re: help guys my car won't start
« Reply #4 on: May 06, 2011, 02:36:18 »
since the fuel is not gushing out of the return of the injection pump I remove the check valve thet the return hose conects to than turned on the key and fuel now gushes out . I do not have gages for fuel presure testing ,can I asume the fuel pump is no good or the check valve?
Thanks
1994 E500 W124
1971 280sl
1989 Porsche 930 coupe
1988 e30 m3
2001 ducati mh900
2006 ps1000
1962 Vespa GS160

ja17

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Re: help guys my car won't start
« Reply #5 on: May 06, 2011, 02:56:26 »
Hello Erick,

Don't start replacing expensive parts until you find the cause of your problem. Take a hot wire and activate the starting solenoid for a few seconds while someone cranks the engine.  If it starts, you most likely have a fuel delivery problem.  Something clogged or a bad elec. fuel pump.  Make sure you hear the elec. fuel pump running when the ignition is on.

You can go to the hardware store and just buy a reg pressure gauge (for water) it will work fine. Try to find a gauge which does not go too high so you can read the small pressures easily. Next go to the auto parts store and buy 36" of low pressure 5/16 " fuel line. and two small hose clamps. Check to see if you need to add a fitting on the pressure gauge so you will be able to clamp the fuel hose to it. I like to clamp the other end to the end of the metal fuel line going to the intake solenoid.
Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback

erickmarciano

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Re: help guys my car won't start
« Reply #6 on: May 06, 2011, 17:37:29 »
Thanks guys
before I can't purchase the pressure gage before the weekend,I did a quick test . with the key on I am able to hold the pressure from the supy line right after the fuel filter with my thumb with no to much pressure.should 10psi be hard to hold?
thanks
1994 E500 W124
1971 280sl
1989 Porsche 930 coupe
1988 e30 m3
2001 ducati mh900
2006 ps1000
1962 Vespa GS160

ja17

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Re: help guys my car won't start
« Reply #7 on: May 06, 2011, 19:40:42 »
Hello Erick,

It depends how strong your thumb is !  ;D

Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback

ja17

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Re: help guys my car won't start
« Reply #8 on: May 06, 2011, 19:47:51 »
Erick,

You may want to remove a spark plug or two and see what they look like.
Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback

Benz Dr.

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Re: help guys my car won't start
« Reply #9 on: May 07, 2011, 12:59:41 »
Sounds like a bad fuel pump to me. You have no pressure so your car won't start well after it's hot. Very unlikely to be a plugged fuel filter - not sure why people suggest that considering the size of the filter. It will hold a lot of dirt.
1966 230SL 5 speed, LSD, header pipes, 300SE distributor, ported, polished and balanced, AKA  ''The Red Rocket ''
Dan Caron's SL Barn

1970  3.5 Coupe
1961  190SL
1985   300CD  Turbo Coupe
1981  300SD
2013  GMC  Sierra
1965  230SL
1967 250SL
1970 280SL
1988 560SEC