Vintage car buffs may scoff at modern technology like fuel injection, but the truth of the matter is that fuel injection has been around nearly as long as the venerable carburetor. Experiments in fuel injection began early in the 1900s, and the technology became available on commercial diesel engin…
Minor additions to this great write-up:
For future reliability, change all fuel lines to braided stainless Teflon lined hose. It is impervious to virtually all fuels including ethanol. Most stainless hose is rubber lined, so be careful. Get rid of that rubber if you are going to used pump gas.
Don't be scared to tune mechanical injection with a wide band set up. If possible, check every cylinder separately. You can change injector size to match flow rates to individual cylinders. The aircraft industry has been doing this for years.
Thanks again MM for the great article!
i thought this thread was gonna be about USA HILBORN fuel injection, came out around 1949-50, before Mercedes 300sl, but wiki says some german engines used it in the early 1930S, or earlier!
are we talking port injection or direct chamber injection?
more info about fuel injection, little known fact is Electronic fuel injection was pioneered and patented by a USA company,BENDIX corp. i actually drove a 1957 AMC Rambler REBEL with efi in 1957, it was fairly good(not perfect), but Transistor technology was in its infancy!
and BOSCH thought well of it and bought license and patent rights from Bendix.
thats just KOOL.
Very important for early FI cars is to use non-ethanol gas too. Pure-gas.org.
In reply to CFreeborn :
I agree with you. This should be the first thing on the list.
An add-on to a good article. If you got disgusted with your factory EFI and retrofitted Webers or a Holley, do NOT expect the EFI fuel pump to work as a plug-in. At 50 psi regulated down to 5 psi, the EFI pump will thermally overload, shut off and you'll spend quite a bit of time alongside the highway waiting for it to cool down & reset
At least on a SPICA. Other brands may just pop a fuse so its tow-truck time for you.
A friend owned a Maserati 3500 GT with injection and Mercedes used it on the 300 SL back in the early 1950s.
Triumph even used it on the TR6 in the home market but North America had to make do with carbs and instead of 150 bhp they got 104 bhp.
Relieve pressure in line first; D/C battery, pull fuel pump fuse, start engine and run till it dies. Now disconnect fuel filter hoses and replace filter. Otherwise, you will get gas spray all over if you disconnect with pressure in the line.
After just going through a Porsche CIS system, I would add to the above the importance of getting a smoke machine and looking for leaks. And to keep going, after fixing leaks, to smoke test again until all sealed. My box was fine. But I had some rubber things that needed replacing or tightening. And while going through that, I never noticed the smoke coming out of the throttle shaft until the others were fixed.
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