I've recently finished building my car back up but am having slight problems. Basically it started misfiring at high loads, cutting out completely when hot and seemed to lean out badly when going downhill if I took my foot off the throttle.
The car has had a group A coil, new leads, plugs, dizzy cap and rota arm so it cant be a spark problem.
The fuel pump was also replaced for a Focus WRC pump thats a higher output than a Bosch 044 so its not the pump.

What I'm wondering is could it be the fuel accumulator causing this which I desided to keep when I went to MFI? I was told to keep it as it helps stop fuel surge etc but can they fail and cause these sorts of problems?

 

Also all the Fuel lines were replaced with brand new braided lines and it had a new Mahle fuel filter so cant see it being a blockage?

If I ditch the Accumulator can I still keep the MFI tank and pump?

 

I have no accumulator on mine and i have the standard tank and pump ,check the tank is not dented which may cause a blockage

 

I never noticed a dent in the tank when I took it off and painted it Dave

 

ok just a thought, try the accumulator

 

Might just buy a new fuel tank and bypass the accumulator, see if it sorts it. Just seemed weird how it only happend going down hill off throttle, when the car was warm etc.

 

Have no accumulator on mine either, junked it when i went efi as it's not needed.

 

+1

 

no accumulator here either, external swirl pot though.

 

I always kept the accumulator on my cars with MS.
No problems if the injectors don't leak.

 

I dont have accumulator either and standard fuel pump is well enough over 250bhp proven.
I suggest you first find out which is the problem spark or fuel before replacing parts