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Old 04-12-2016   #1
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New Zealand 
850 Sport 30 DIC Carb

What? no 850 specific section in the Forums?

Recently bought a 1970 850 Sport. Motor has apparently been reconditioned and not really driven since. Got her home and she was running a bit rough.

Fuel pump had a small leak, so I opened it up and noticed the pump filter was clogged with rust. So, took the carbie (30 DIC 23/23) apart and found it full of rust. Did I mention there wasn't an inline fuel filter installed? Sigh.

Tank obviously has gone rusty while sitting around.

Ran well after carb clean, but despite installing inline filter, there was obviously some rust still in the system and the jets clogged. Cleaned a couple of times and ran, but decided I'd flush all the lines and reclean the carbie.

But it all back together and now it doesn't want to start. Spark and timing have been checked. Not sure what I did wrong. It just cranks forever without firing. Couple of times it fired and ran for a second or two, but dies almost immediately. Can't get revs up. Tried a bit of ether (a can of "Start Ya' Bastard"!), but apart from a small fire or two, nothing.

Knowing enough to get myself in trouble but not enough to necessarily get out of trouble I'm a little stumped. I just studied a diagram of the carb and noticed that there is one part of the carb that I didn't specifically clean - the emulsion jets. I unscrewed the bung above them, and probably squirted cleaner down the holes, but didn't remove then and clean them. Didn't know I could.

So, is it possible that the emulsion jets are my problem? Have I possibly flushed all the rust into the emulsion jets and clogged them while cleaning?

How do I get them out? Do I need to use pliers or something?

Sorry for all the questions! Just hoping for a little advice before I pull the carb off again.

No, I didn't change the gaskets in the carb or on the manifold. Will do in future, but they seemed to be in good shape...

Finally, I've seen reference on mrFiat to a fuel pressure regulator for the 850 - I don't have one. Is this necessary when running the standard mechanical fuel pump?

Sorry again for a long post full of questions!
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Old 06-12-2016   #2
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Re: 850 Sport 30 DIC Carb

Haynes do an excellent Weber carbs manual and the truly ghastly 30DIC is covered. Nasty little carb.
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Old 09-12-2016   #3
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Re: 850 Sport 30 DIC Carb

It's unlikely that the emulsion tubes are to blame.
I own an 850 Sport Coupé and have rebuilt a couple of 30 DICs. There's nothing much about them.
Are you getting any fuel inside the cylinders? Try resetting the carb's mixture screw. Is the choke working?
I also don't run an inline filter and it's ok, the pump's and the carburetors' filters are enough. A pressure regulator is not required for a mechanical pump.
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Old 28-12-2016   #4
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Re: 850 Sport 30 DIC Carb

Hi FH3453

The starting problem sounds more likely to be the condenser on the distribibutor, they generally fail after not being used for ages, especially if the ignition is switched on for long periods with the engine not running.

it will cost a couple of £s for a new one but dont change the points gap.

have fun

Tim
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Old 14-01-2017   #5
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Re: 850 Sport 30 DIC Carb

Hi Guys

Thanks for the responses. Sorry for the delay in getting back, been on summer holidays here in New Zealand.

Tim - you were right, I've put it back together and replaced the condensor and shes running very well now. Thanks very much!
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Old 19-03-2017   #6
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Re: 850 Sport 30 DIC Carb

Hi!
Can someone of you be so kind and post some pictures from the 30 DIC, and its mount on the manifold? I plan some changes on my Marbella (903ccm, 09NCB engine) and I plan to change carb too. One option could be a 30 DIC.
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Old 20-03-2017   #7
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Re: 850 Sport 30 DIC Carb

I am currently driving a 1971 850 Sport Spider. ( Sold my "72 850...)

If your carb is full of rust then I suggest that you rebuild it. The rebuild is a small price to pay for the piece of mind that it is clean.

A rusty fuel tank needs to be removed, treated, and replaced before putting gasoline back into it. (KBS, Eastwood, Red Coat, etc... all sell good DYI kits).

I would not run any motor without an in-line fuel filter. Again, a small price to pay for a clean system fuel system in the carb and motor.

If "emulsion jets" are the idle jets or the main jets on your carb, then by all means they need to be inspected for blockages. The jets can be removed with a flat blade screw driver, thoroughly cleaned, and reinserted into their respective places.

As far as a fuel regulator goes, you do not need one if you are running a stock mechanical fuel pump. If you are running an electric fuel pump (which I would recommend), then get a 4 /6 pound electric pump, and you will not need a regulator for that as well. Just block off the mechanic fuel pump opening (a number of distributors sell a plate that fits well and seals this opening) and install the electric pump on the left inside fender by the windshield wiper fluid bag.

I hope that this helps out. I have done a number of upgrades to my 850's to make them more reliable, and am happy to share... v

It is good to see questions about the little rear engine car that can....

850 Dave
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