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Car leaning out after driven for a long time

16K views 2 replies 3 participants last post by  Hemihackman 
#1 ·
So I recently placed the MMX drop in piston and rods with their blower cam and MDS delete an ATI 18%OD lower. I placed a Procharger P1SC-1 on the car with the race front mount. For the fuel system I used the 400lph pump setup they send with the kit and 52# injectors. The tuner said the car was running out of fuel. I got FIC1000’s and a Kenny Bell BAP 21v. Tuner said that seemed to fix it. A couple days later we were driving around in the city mostly stop and go for about 1-1.5 hours, then got on the interstate and made a hit and went lean. Well I figured I was collapsing one of the fuel lines or draining the fuel basket. I then upgraded to the Tapped Performance single FORE drop in TI267 pump. Everything seemed fine once again. Then I found out a couple days later that ¼ tank is now empty without the fuel canister LOL. Well after driving the car around for a couple hours on a long steady speed drive around 55mph for about 1.5 hours with some stopping to look at some scenery. I got on the interstate to head home. After punching the gas around 65 the AFR dropped to low 11's for a second then spiked instantly to 16-17AFR and I immediately let out. The gas tank was at 1/2. Then after a mile slowed down and rolled into a little easier and bam same thing. Of course, I didn't plan on running it hard so I left the computer at the house so I don't have a log. I went home and left it to cool off for about 2-3 hours. Went out with the computer this time filled up to 3/4 tank and after the car was up to temp I tried to repeat the pulls. Everything was fine AFR mid 11’s hitting 10.9PSI. I’m at loss as to why it did the same thing as before. Is there anyway the fuel can be vapor locking in the fuel rails or boiling? I touched the fuel rails and they were crazy hot. What about the BAP its warm always and the last time it did this I checked the hobs switch and used a volt meter and it was putting out 21volts. ANY IDEAS????
 
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#2 ·
Dude! Big blob of text gives folks a headache. Damn!

From what I could get from it you may have a blower gasket leak. Or o2 sensors loosing it.

How about some paragraphs and some line breaks eh?
 
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