Troubleshooting Howell EFI

B1oodyBuzzard

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Apr 20, 2012
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Today I finally got to attempt starting the 40 for the first time since installing a howell kit. My issue currently is that shortly after the engine starts it backfires through the intake. I’m reading online different causes but I was hoping someone here has some experience with this.

I am running a DUI distributor with the rpm connected to the harness. Maybe a timing issue? I felt confident in setting TDC and installing the distributor…

Online I read that running lean can cause similar issue. Wondering your thoughts.

At the same time, I saw in the instructions that inadequate flow on the fuel return can cause issues with fuel pressure.

I was also wondering if maybe throttle position. I haven’t got a throttle linkage set up yet and have just been holding the tbi by hand.
 

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