Got new fuel pumps installed and...

Molon Lave

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Drove it home, got on it a couple of times and after shifting to the next gear at about 6200 and hitting the gas hard it fell on its face. Wouldn’t recover until I got off the gas. Almost like the gas pedal was stopping any fuel pressure. Driving normal it was fine. Mechanic told me more than likely the computer needs time to reset. I would appreciate your thoughts or experiences on this, thanks.
 

02gt87

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Drove it home, got on it a couple of times and after shifting to the next gear at about 6200 and hitting the gas hard it fell on its face. Wouldn’t recover until I got off the gas. Almost like the gas pedal was stopping any fuel pressure. Driving normal it was fine. Mechanic told me more than likely the computer needs time to reset. I would appreciate your thoughts or experiences on this, thanks.
Did you do a pprv delete ?

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Molon Lave

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What was in the hat before?

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Bosch blues, I believe they are the stock ones, no? Anyway they were maxed out and at least one of them was on its way out if not both. Fuel pressure was dropping Under 40 when getting on it. Down to 26, low 30’s. When shifting fast at high rpms the engine would cut out for a split second and continue like normal under WOT. So with all those problems it was time to replace and go bigger
 

02gt87

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Bosch blues, I believe they are the stock ones, no? Anyway they were maxed out and at least one of them was on its way out if not both. Fuel pressure was dropping Under 40 when getting on it. Down to 26, low 30’s. When shifting fast at high rpms the engine would cut out for a split second and continue like normal under WOT. So with all those problems it was time to replace and go bigger
You will most likely need a tune, is this a return or returnless setup?

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04oxfordvert

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sounds like if you had stock hat, pumps ,with a pprv in it, that is normal if its a returnless system. falls on face at wot durning a shift, let off throttle and picks back up. my car will do this. Return system goin in this winter.
Drove it home, got on it a couple of times and after shifting to the next gear at about 6200 and hitting the gas hard it fell on its face. Wouldn’t recover until I got off the gas. Almost like the gas pedal was stopping any fuel pressure. Driving normal it was fine. Mechanic told me more than likely the computer needs time to reset. I would appreciate your thoughts or experiences on this, thanks.

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01yellercobra

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I'm wondering if a line, clamp, or something popped off one of the pumps.
Generally if a line pops off it won't even start. It might start if a clamp let go, but the one time it happened to someone I know the car wouldn't even start.
I went bigger. Replaced with walboro 465’s per lethal performance recommendation
I think there's a whole lot of info missing here. You don't just go from stock pumps to 465's. Especially for a shift hesitation that can be tuned out. I'm pretty sure you can't run 465's in a returnless set up. So did you go full return? What else was done when the pumps went in?
 

03cobra#2

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Generally if a line pops off it won't even start. It might start if a clamp let go, but the one time it happened to someone I know the car wouldn't even start.I think there's a whole lot of info missing here. You don't just go from stock pumps to 465's. Especially for a shift hesitation that can be tuned out. I'm pretty sure you can't run 465's in a returnless set up. So did you go full return? What else was done when the pumps went in?
Yup. Op please give a run down of events and exactly what was done.
 

Molon Lave

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Still returnless, All I did was replace the stock pumps with 465s cause that’s what Lethal recommended. Before the stock pumps started going out on me the car ran perfect
 

Molon Lave

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Yup. Op please give a run down of events and exactly what was done.
At high rpm fast shifts, when in next gear and full throttle it cut out for a split second and recovered while foot on gas. Hooked up scanner and showed at WOT fuel pressure dropped well below 40. Conclusion was to replace fuel pumps. Replaced with 465s and under same conditions the car falls on its face for as long as foot is at full throttle. Only when you let off gas pedal does it recover
 

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