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The Terminator
Engine/Tuning
Upgrading pumps to fix hesitation and fuel supply
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<blockquote data-quote="91svtcoupe" data-source="post: 15487820" data-attributes="member: 84794"><p>Fuel pump questions/issues </p><p></p><p>03 Swap into 02 GT (possible fuel pump or pumps failure or going bad)</p><p></p><p>Mods include:</p><p></p><p>Stock blower</p><p>2.9 pulley</p><p>Kooks Longtubes and H pipe</p><p>Single blade tb</p><p>JLT short CAI</p><p></p><p>Lund Tune</p><p></p><p>(75k miles)</p><p>Stock tank</p><p>stock pumps</p><p>Stock FPDM with wire upgrade/relay</p><p></p><p>1) Was experiencing hesitation at the top end of 3/4 throttle boost pulls and with the Aeroforce scan gauge showing 95% fuel pump duty cycle </p><p></p><p>2) 2nd or 3rd gear stab of throttle , extreme fall on its face reaction.</p><p></p><p>remedies......remove stock hat to remove pprv , installed aftermarket hat with stock pumps back in it's place. </p><p></p><p>same results as mentioned in 1 and 2 above</p><p></p><p>I have (2) 340lph pumps, I am going to install, feeling that fuel demand/supply is the issue</p><p></p><p>question?? </p><p></p><p>Lund said with upgraded fuel pumps I would not need a revision tune. </p><p></p><p>I did not clarify I was going with 340 pumps when I sent my question to him, so does anyone have experience with this and do you see any potitienal problems, by installing 2 larger pumps with no tune revisons?</p><p></p><p>anything else that maybe be happening to cause the issues in 1 and 2 above?</p><p></p><p>Trying to get the car so I can enjoy it a little more but with the issues , I've been to afraid to push in on it.</p></blockquote><p></p>
[QUOTE="91svtcoupe, post: 15487820, member: 84794"] Fuel pump questions/issues 03 Swap into 02 GT (possible fuel pump or pumps failure or going bad) Mods include: Stock blower 2.9 pulley Kooks Longtubes and H pipe Single blade tb JLT short CAI Lund Tune (75k miles) Stock tank stock pumps Stock FPDM with wire upgrade/relay 1) Was experiencing hesitation at the top end of 3/4 throttle boost pulls and with the Aeroforce scan gauge showing 95% fuel pump duty cycle 2) 2nd or 3rd gear stab of throttle , extreme fall on its face reaction. remedies......remove stock hat to remove pprv , installed aftermarket hat with stock pumps back in it's place. same results as mentioned in 1 and 2 above I have (2) 340lph pumps, I am going to install, feeling that fuel demand/supply is the issue question?? Lund said with upgraded fuel pumps I would not need a revision tune. I did not clarify I was going with 340 pumps when I sent my question to him, so does anyone have experience with this and do you see any potitienal problems, by installing 2 larger pumps with no tune revisons? anything else that maybe be happening to cause the issues in 1 and 2 above? Trying to get the car so I can enjoy it a little more but with the issues , I've been to afraid to push in on it. [/QUOTE]
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Upgrading pumps to fix hesitation and fuel supply
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