You talking about the mechanical pumps like of some of the MB (and Alfas?) in the late '60s? I've got 200 k miles on my 67 MB pump with no issues. Bosch K-Jet (CIS) works well too if the fuel is clean. Agreed, diesel is great as long as the pump is kept clean inside.
I'm talking about Bosch mechanical gasoline injection. Not the pump. Essentially the air flow meter which is just a large plug on a stick opens little slits allowing for more available fuel. Than there is diaphragms and regulators and adjustments and vacuum bullshit up the wazoo to fine tune it. It's a fucking nightmare.
Edit: Yes K-Jetronic falls in this category.
OK. Bosch also made a mechanical gasoline injection system that used a pump similar to a diesel, based on similar systems used on aircraft to deal with problems with float bowls during high G manouevers. I don't think they have been in common use for 50 years. What you are talking about is the K-Jetronic system with the fuel distributor sitting atop an air box with the round metering flap. Easy enough to maintain if the fuel is kept clean but the distributor is considered factory rebuildable only. It's a messy nightmare like you described, requiring special jigs and gauges to set it up correctly. the pump is worth as much as the car. https://www.hemmings.com/parts/item/Air-Intake--Fuel-Delivery/Fuel-Injection/Porsche-911-Bosch-MFI-Mechanical-Injection-Pump/19835.html '
I've had to get more than a few Mercedes with K-Jetronic running properly without factory rebuilds. Monitoring fuel pressures on either side of a diaphragm because that REALLY matters. It's the main control after the fuel slits. By slits I mean actual slits. The air flow meter "plug on a stick" moves a piston up or down in a slitted cylinder allowing more or less available fuel.
And if you've had any fuel quality issues, like perhaps... Ethanol. Or any other contamination LOL get fucked!
I might be telling you what you already know but I had to fix them by utilizing thousands of slides of Microfiche. For fucks sake. All that shit belongs in a museum or a collector's garage. Not in the garage of the average Joe or a grandma with sentimental value.
Yup.
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