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Author Topic: No or Little Fuel at Injector Pump Cylinder One  (Read 1801 times)

mBdrvr

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No or Little Fuel at Injector Pump Cylinder One
« on: July 23, 2022, 23:02:52 »
My engine is misfiring and smoking out the tailpipe, Cylinder 1 is the issue. Swapped plugs, injectors, & wires. Good compression.

Removed cylinder 1 fuel line at the injector pump. No fuel while cranking. Small amount at idle. Cylinder 2 (and the others) get fuel. The injector pump was rebuilt.

See link: https://youtube.com/shorts/iT95P-wamZA?feature=share

Any ideas??
« Last Edit: July 24, 2022, 02:49:42 by mBdrvr »
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Paul Greenblatt
'70 280 SL
'66 250 SE Cabrio
'60 190 SL

ja17

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Re: No or Little Fuel at Injector Pump Cylinder One
« Reply #1 on: July 24, 2022, 03:07:47 »
If the 19mm fitting on top of the injection pump for that injector line is not torqued tight enough, then that cylinder of the IP, may not pump fuel. On an M130 the torque is 21 ft./lbs. Be careful because over-torqueing it can damage the pump.
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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

Kevkeller

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Re: No or Little Fuel at Injector Pump Cylinder One
« Reply #2 on: July 25, 2022, 03:36:08 »
How long has your engine been unused?  Maybe the piston is stuck in the up position?  I had to take out the check valve and tap the piston down to loosen it.
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1970 280 SL

mBdrvr

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Re: No or Little Fuel at Injector Pump Cylinder One
« Reply #3 on: July 25, 2022, 19:03:17 »
The car sat over the winter. Prior to that there was a puff of white/blue smoke on acceleration.

Lots of fuel was released after I removed the cylinder 1 pump port fitting and spring.

I didn't have the right tools to torque it down again. I'll try it tonight.
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Paul Greenblatt
'70 280 SL
'66 250 SE Cabrio
'60 190 SL

mBdrvr

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Re: No or Little Fuel at Injector Pump Cylinder One
« Reply #4 on: August 01, 2022, 03:27:09 »
What’s the torque for the M129 FIP?
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Paul Greenblatt
'70 280 SL
'66 250 SE Cabrio
'60 190 SL
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