The V8 Owners Forum -

That's very expensive, have a look at OBP https://www.obpltd.com/product-category/fuel-water-swirl-pots/bulkhead-mount-swirl-pots/ A return form the fuel rail keeps the fuel in the rail cooler. You need one if the rail is designed that way, otherwise you're just going to trade one problem for anothe...

If you suspect the injectors, swap 2&8 with 4&6 and see what happens.

That does sound very high. I'm running Speeduino (very similar to MS2) and I'm idling at about 9/10 degrees.

You can add photos directly into your post by using the 'Attachments' tab below the 'Save draft/Preview/Submit' buttons (or as it suggests just dragging the picture files into this edit box)

I'm glad you got it sorted, even if you had to take the long road.

It isn't really a return on the expansion, it's a vent for excess. Either dump it or catch it in a bottle and if you have the right pressure cap it'll get sucked back in as the water cools.

What does your waterpump look like? Every connector on it is an input so one of them can be used for the output from the inlet manifold and the heater matrix. The expansion tank is either just a vent or goes to a catch tank dependent on if you have a two way cap on it or not.

Hi, from Argentina. I've rebuilt several Mercedes from the 80s and 90s. I've had no problems with 4- and 6-cylinder models. However, I'm currently building a W126 V8, and I can't program the fuel injection. It always comes out too rich. I use Tuner Studio and simultaneous fuel injection. Any ideas? ...

According to Google Translate Hello, I'm from Argentina and have been an electronics technician for 55 years. A few years ago, I started tinkering with ECUs. I own several cars, and as a hobby, I began reworking some with ECUs, first with Megasquirt and now with Sppeduino. I make my own boards depen...

Also, where in the world are you? I assume somewhere in the UK.....

Looks like TVR-esque exhaust routing.

Pushing air in and out dislodged a blockage? Whatever, a result is a result

Bit of an extreme way to up the compression ratio.....

Looks a bit like the trouser manifold here https://www.mez.co.uk/ms12-new.html. Basically a hack to get the carbs to fit under the bonnet.

When I was rebuilding my engine I had coolant getting into the sump due to a dodgy valley gasket.

Post some pictures so we can see what you've got.