Accumulators/fuel pressure and LH

heckflosse · Feb 23rd, 2015, 13:59

Is the fuel accumulator vital for our climate?
The old CI system used it for good starting, but am I right in thinking an LH 240 doesn't have one?

I'm swapping the LH2.4 system from a 940 into a car that was early CI (79 260), and figure it best to give the rusty old accumulator the heave ho.
Any thoughts, wise ones?
Cheers,
Jim.

Antz · Feb 23rd, 2015, 15:11

I binned the accumulator from my 240 when I switched to the T5 engine. OK it wasn't needed for that engine but it was just another thing to break down and cause problems. But then I also ditched the external pump and run a AEM 1000-50 in the tank now.

crogthomas · Feb 24th, 2015, 09:21

The purpose of the accumulator is to maintain a steady fuel pressure, damping out any pulsing from the pump.
On a LH equipped car this job is done by the fuel pressure regulator on the fuel rail. LH cars don't have accumulators.

Although I do find myself wondering if it might be a good way to counteract fuel surge on a track car...

heckflosse · Feb 24th, 2015, 09:31

Thanks.
I was under the impression it was really just a sort of fancy drain back valve, but you have given me the answer I was after.
Fuel surge? is that a problem with injection? Wish I was that fast round corners!
Jim,.

Clifford Pope · Feb 25th, 2015, 13:10

Quote:

Originally Posted by crogthomas

On a LH equipped car this job is done by the fuel pressure regulator on the fuel rail. LH cars don't have accumulators.

I thought the cylinder bolted to the external pump under the rear nearside passenger seat was a filter/accumulator?

crogthomas · Feb 25th, 2015, 13:33

Yes, that's the LH fuel filter.

The K-jet accumulator has a big spring in it to damp the flow. A bit like a gasometer (which uses gravity instead of a spring).

140 · Feb 28th, 2015, 19:51

The main purpose of the accumulator was to hold pressure between the accumulator and the fuel distributor when the engine was switched off to prevent fuel vaporisation and aid hot restarts. It was a factory mod to fit a later six cylinder accumulator (B27E) with lager capacity to prolong the pressure held in hot climates but these were only used on K-Jetronic.

Feb 23rd, 2015, 13:59	#1
heckflosse Premier Member Last Online: Oct 28th, 2023 12:30 Join Date: Feb 2009 Location: dereham	Accumulators/fuel pressure and LH Is the fuel accumulator vital for our climate? The old CI system used it for good starting, but am I right in thinking an LH 240 doesn't have one? I'm swapping the LH2.4 system from a 940 into a car that was early CI (79 260), and figure it best to give the rusty old accumulator the heave ho. Any thoughts, wise ones? Cheers, Jim.

Feb 23rd, 2015, 15:11	#2
Antz No I'm not the redhead Last Online: Nov 25th, 2022 09:49 Join Date: Jun 2009 Location: North Yorkshire Coast	I binned the accumulator from my 240 when I switched to the T5 engine. OK it wasn't needed for that engine but it was just another thing to break down and cause problems. But then I also ditched the external pump and run a AEM 1000-50 in the tank now. __________________ 1988 Volvo 240 GLT T5 Swap a T5 motor into your RWD Volvo:The Guide

Feb 24th, 2015, 09:21	#3
crogthomas Master Member Last Online: Jun 12th, 2024 11:41 Join Date: Jan 2008 Location: Bracknell, Berkshire, UK	The purpose of the accumulator is to maintain a steady fuel pressure, damping out any pulsing from the pump. On a LH equipped car this job is done by the fuel pressure regulator on the fuel rail. LH cars don't have accumulators. Although I do find myself wondering if it might be a good way to counteract fuel surge on a track car...

Feb 24th, 2015, 09:31	#4
heckflosse Premier Member Last Online: Oct 28th, 2023 12:30 Join Date: Feb 2009 Location: dereham	Thanks. I was under the impression it was really just a sort of fancy drain back valve, but you have given me the answer I was after. Fuel surge? is that a problem with injection? Wish I was that fast round corners! Jim,.

Feb 25th, 2015, 13:33	#6
crogthomas Master Member Last Online: Jun 12th, 2024 11:41 Join Date: Jan 2008 Location: Bracknell, Berkshire, UK	Yes, that's the LH fuel filter. The K-jet accumulator has a big spring in it to damp the flow. A bit like a gasometer (which uses gravity instead of a spring).

Feb 28th, 2015, 19:51	#7
140 Junior Member Last Online: Apr 24th, 2024 18:13 Join Date: Feb 2015 Location: Norwich	The main purpose of the accumulator was to hold pressure between the accumulator and the fuel distributor when the engine was switched off to prevent fuel vaporisation and aid hot restarts. It was a factory mod to fit a later six cylinder accumulator (B27E) with lager capacity to prolong the pressure held in hot climates but these were only used on K-Jetronic.

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