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Injector Pop-Tester Adapter for the Deuce/Multifuel
As many of us have found, it's tough, if not impossible, to find a pop-test adapter to fit the Multifuel injectors. This is due to the fact that Multifuel injectors have 1/2-20 female threads (uncommon for fuel injectors). From what I understand, the adapter we need has been out of production for quite some time.
The following set-up doesn't require cutting/sacrificing any lines, it consists of high PSI fittings, and it's pretty cheap ($20-$25). It's not a Rolex, but it gets the job done...
On the injector side, I used a BQ248 by Brakequip (I'll post info below as to where the fittings can be sourced). It has the male 1/2-20 threads on one end, and is 1/8 NPT female on the other end. The 1/2-20 end doesn't have the tapered cone like a fuel line, but it does have a nice flat face milled on the end. That flat end corresponded nicely to a flat shoulder in the injector line bore, perfect for using a crush washer in between the fitting and the injector. Finding a crush washer that small is tough, so I just went to Home Depot and bought a pack of #10 BRASS Flat Washers. The washer will "dish" a bit as you tighten the adapter into the first injector you test. Just put the dome side toward the injector, and the dish side toward the adapter when you place it in the next injector. I just got done testing 12 injectors, using the same washer.
On the injector side, a Tompkins Industries MC6051-L06-02 fitting works well. It has an M12x1.5 male end which works with the M12 test line that is included with most pop-testers. The M12x1.5 fitting end has a tapered compression bore that sealed well to the tester line (the fitting comes with an M12 compression nut and 6mm sleeve that aren't needed, just exile them to your spare fitting drawer). The other end of the fitting has a male 1/8 NPT. I wraped teflon tape around the 1/8 NPT male end, making sure to keep the tape back from the end about .060" to prevent any tape bits from getting into the test line. After wrapping with the teflon, I tightened the male 1/8 NPT into the female end of the Brakequip fitting to complete the adapter.
To test an injector I'd put a #10 brass flat washer in the injector line bore, thread the 1/2-20 adapter end into the injector, attach the M12 end to the test line, and viola! No need to crank down on the fittings when attaching to the injector and test line. Just a little snug-up with the right sized wrenches kept everything tight. Just remember to take the brass washer out of the injector bore when you're done testing.
From Tubes and Hoses of Loveland (Justin) ph 970-593-6988
Brakequip #BQ248................. $4.04
Tompkins MC6051-L06-02....... $5.30
.............................................$9.34 + Shipping
Home Depot;
10 ea. #10 Brass Flat Washers.$1.18
Testing and Servicing Multifuel Injectors; https://www.steelsoldiers.com/attachment.php?attachmentid=666720&d=1487267247 pages 4-396 thru 4-414
View attachment 708536
As many of us have found, it's tough, if not impossible, to find a pop-test adapter to fit the Multifuel injectors. This is due to the fact that Multifuel injectors have 1/2-20 female threads (uncommon for fuel injectors). From what I understand, the adapter we need has been out of production for quite some time.
The following set-up doesn't require cutting/sacrificing any lines, it consists of high PSI fittings, and it's pretty cheap ($20-$25). It's not a Rolex, but it gets the job done...
On the injector side, I used a BQ248 by Brakequip (I'll post info below as to where the fittings can be sourced). It has the male 1/2-20 threads on one end, and is 1/8 NPT female on the other end. The 1/2-20 end doesn't have the tapered cone like a fuel line, but it does have a nice flat face milled on the end. That flat end corresponded nicely to a flat shoulder in the injector line bore, perfect for using a crush washer in between the fitting and the injector. Finding a crush washer that small is tough, so I just went to Home Depot and bought a pack of #10 BRASS Flat Washers. The washer will "dish" a bit as you tighten the adapter into the first injector you test. Just put the dome side toward the injector, and the dish side toward the adapter when you place it in the next injector. I just got done testing 12 injectors, using the same washer.
On the injector side, a Tompkins Industries MC6051-L06-02 fitting works well. It has an M12x1.5 male end which works with the M12 test line that is included with most pop-testers. The M12x1.5 fitting end has a tapered compression bore that sealed well to the tester line (the fitting comes with an M12 compression nut and 6mm sleeve that aren't needed, just exile them to your spare fitting drawer). The other end of the fitting has a male 1/8 NPT. I wraped teflon tape around the 1/8 NPT male end, making sure to keep the tape back from the end about .060" to prevent any tape bits from getting into the test line. After wrapping with the teflon, I tightened the male 1/8 NPT into the female end of the Brakequip fitting to complete the adapter.
To test an injector I'd put a #10 brass flat washer in the injector line bore, thread the 1/2-20 adapter end into the injector, attach the M12 end to the test line, and viola! No need to crank down on the fittings when attaching to the injector and test line. Just a little snug-up with the right sized wrenches kept everything tight. Just remember to take the brass washer out of the injector bore when you're done testing.
From Tubes and Hoses of Loveland (Justin) ph 970-593-6988
Brakequip #BQ248................. $4.04
Tompkins MC6051-L06-02....... $5.30
.............................................$9.34 + Shipping
Home Depot;
10 ea. #10 Brass Flat Washers.$1.18
Testing and Servicing Multifuel Injectors; https://www.steelsoldiers.com/attachment.php?attachmentid=666720&d=1487267247 pages 4-396 thru 4-414
View attachment 708536
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