High flow fuel pump
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Cargo Master
Joined: Oct 2004
Posts: 2,148
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From: Seneca, SC
High flow fuel pump
Soooooooo here's the problem. The build has a Wide band O2 sensor on it and I have the following issues.
During regular driving the truck runs rich, and I set this on purpose because...
During WOT the engine stays right in the 12:1 A/F range, but past 3800 it starts to lean out (red line at 4500...ish). Starting rich makes it only slightly lean at red line. I was thinking it was a jetting/vacuum secondary/timing issue, but after trying all I can try with this it looks like I can either have correct a/f ratio at cruise and stupid lean under WOT or really rich at cruise and okay at WOT. A guy at work said it sounds like I'm losing fuel pressure. Kind of makes sense so far since the stock pump is made to support a 85 cfm single barrel.
Haven't done any testing yet to see if the fuel pressure drops with the lean condition (will re-post once I do) but I'm wondering what mechanical pumps will work with this motor. I seriously doubt that I need more than a mildly upgraded mechanical pump to support this motor. Thanks in advance.
During regular driving the truck runs rich, and I set this on purpose because...
During WOT the engine stays right in the 12:1 A/F range, but past 3800 it starts to lean out (red line at 4500...ish). Starting rich makes it only slightly lean at red line. I was thinking it was a jetting/vacuum secondary/timing issue, but after trying all I can try with this it looks like I can either have correct a/f ratio at cruise and stupid lean under WOT or really rich at cruise and okay at WOT. A guy at work said it sounds like I'm losing fuel pressure. Kind of makes sense so far since the stock pump is made to support a 85 cfm single barrel.
Haven't done any testing yet to see if the fuel pressure drops with the lean condition (will re-post once I do) but I'm wondering what mechanical pumps will work with this motor. I seriously doubt that I need more than a mildly upgraded mechanical pump to support this motor. Thanks in advance.
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