Fuel Injector DIY, anyone...? Options

[Prospectfarms]

A few months ago I replaced 2 leaky injectors with new from Now one of the remaining originals has stopped delivering fuel. I assume it's clogged. I don't want to buy another one if I can clear this one. Anyone done it at home? redharvey uses a 3 volt transformer and carb cleaner: http://www.914world.com/bbs2/index.php?s=&...t&p=1514533
Anyone else?

[Prospectfarms]

Well I mined back to that last page of search results. Here's what airsix did: http://www.914world.com/bbs2/index.php?s=&...ost&p=18798

<!-- QuoteBegin-porsche735+Apr 25 2003, 01:16 PM --><div class='quotetop'>QUOTE(porsche735 @ Apr 25 2003, 01:16 PM)</div><div class='quotemain'><!-- QuoteEBegin --> What is the best way to make sure the injectors are free of crap on the inside?  Can you just yank them, spray some brake cleaner in them and blow them out with air?  Is there a better way?

Chris <!-- QuoteEnd --></div><!-- QuoteEEnd -->
If you really want to get the crud out you have to cycle the injector solenoid while pushing a cleaning solvent through the injector.

I backflushed an old set by wiring the injector up to a battery and momentary-on switch. Then I could push the button to open the injector (click!). I've been going to build a nice injector cleaning fixture but what I did last time was just wire up the injector like this, then lightly clamped a length of 3/8" fuel hose over the injector nipple (careful! Don't break the plastic nipple). Then I filled the hose with carb/choke cleaner and pressurized the hose with 10psi regulated air from a rubber tipped air nozzle. Now with the line full of solvent and pressurized I give the battery switch little taps (click, click, click) to backflush solvent through the injector. Stop when only air comes out. I caught the solvent in a clean bottle to see what came out. All of them spit out some debris - one spit out a lot.

I'm embarrased to even describe the technique because it's so Rube Goldberg, but it worked. Next time I need to clean injectors I'll make a nice little rack with a fuel rail and o-ringed bungs etc. etc. Or better yet maybe I can find or borrow a real injector cleaner for cheap. We'll see.

-Ben M.

ps - I don't want to underemphasise that if you do this be careful not to break the injector nipples. They are sheathed in plastic and if you crank down on a hose clamp on one I'm sure it will break. I haven't broken any, but I've seen injectors with broken nipples and they don't look all that sturdy.