Technical > Spud Miller's Cave

injected sbc hard to start

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421Altered:
I'm a newbie to this site, but, I have checked all posts and can't find anyone having the problem I'm having.  Here it is, I've got a 421 sbc injected alky altered.  After I shut it down in the staging lanes, then when restarting, it revs up to maybe 3000 rpm, then immediately slows down to about 3-400 rpm,  it just barely runs, then, it will come up on the pump and run fine.  I think that my idle check valve which is set to 2psi is maybe leaking fuel past it because it's at the very bottom of my tank which is at the bottom of my chassis.  Can anyone help me with this?

Curly1:
Welcome to the site it is almost like already know you. Mine does not start easy and I built a primer system to help it. Turn on primer pump for a few seconds, hit starter and it starts but idles high until it comes on the pump. Then the RPM will drop and I shut off primer pump.

421Altered:
Bruce good to see you here!!!  It's not like that.  If i prime it any at all, it just blows white smoke out collector's till it finally fires up like I said above, rev up real high, then drops way low, you think that its gonna shut off, but, then it comes up on the pump. You ought to see the expressions of the people in the staging lanes when it cranks up!!  I wonder if I shim the idle check valve to say 4 psi.  Would that cause any other problems?  It's a Bird on a Edelbrock tunnel ram, with a Enderle cube, #30 flowed nozzles, a 1/2 DSR belt driven pump.

BK:
2 lbs sounds a little light. 4 should be better. I've been as high as 7. You will need to adjust the idle mixture (barrel valve leak down) after raising pressure. It sounds a lot like how mine starts if Im not priming it.

421Altered:
Thanks to Curley and BK for your replies.  That's the info that I'm looking for, I'll try that next spring when I drag it back out.

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