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08-01-2010, 09:10 PM
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#1
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Join Date: Mar 2010
Location: The Pocono Moutains
Posts: 142
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cc Qjet fuel system help
i want to know if anyone has pulled the stock mechanical pump on an 87 LG4 fbody and used a fpr ? im installing a vortec 5.7L engine with an LT1 cam with no provisions for the mech pump. will my stock in tank pump feed the fpr enough fuel to keep a 5.5psi constant pressure to the stock 87 LG4 Qjet??
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run 12s with a JUNK motor!
^^^^^my new mantra^^^
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08-02-2010, 10:23 AM
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#2
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Sliderule / Moderator
Join Date: Oct 2004
Location: Catawissa PA
Posts: 2,294
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The pump + FP should be fine. I put a 355 in my 84 around 1998. Issue is getting bigger jets/rods. GM use to sell them as part of a retro fit kit, not sure if they still and they weren't cheap.
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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08-02-2010, 10:56 AM
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#3
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Join Date: Mar 2010
Location: The Pocono Moutains
Posts: 142
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thanks PZ, someone else told me it should be adeuate to feed around 300 hp and mine should be pretty mild, the rods/ hangers can be had from S.M.I for 37 plus shipping im looking for cheaper lol if anyone has a set of better rods hangers for around 15-20 shipped to 18428 let me know if your in NW nj i can probably pick up
btw catawissa is that near scranton?
__________________
run 12s with a JUNK motor!
^^^^^my new mantra^^^
Last edited by Flippindabird; 08-02-2010 at 10:57 AM.
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08-02-2010, 06:48 PM
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#4
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Stalker
Join Date: Aug 2004
Posts: 12,078
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Quote:
Originally Posted by Flippindabird
i want to know if anyone has pulled the stock mechanical pump on an 87 LG4 fbody and used a fpr ? im installing a vortec 5.7L engine with an LT1 cam with no provisions for the mech pump. will my stock in tank pump feed the fpr enough fuel to keep a 5.5psi constant pressure to the stock 87 LG4 Qjet??
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did the lg4 cars even have a stock in-tank pump?
if you had a mechanical pump, that was the fuel pump.
Last edited by V; 08-02-2010 at 06:48 PM.
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08-02-2010, 07:07 PM
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#5
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Sliderule / Moderator
Join Date: Oct 2004
Location: Catawissa PA
Posts: 2,294
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Quote:
Originally Posted by Flippindabird
btw catawissa is that near scranton?
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kinda, a little more central PA, I'm a few miles outside of Bloomsburg.
Quote:
Originally Posted by V
did the lg4 cars even have a stock in-tank pump?
if you had a mechanical pump, that was the fuel pump.
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GM used both, an in-tank and mechanical pump on some cars. my 84 was one of the first with the 305HO and there was a hot start problem and GM's fix was to install an elec pump in the tank and I think it was done on all 85+ carb'd cars.
__________________
93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
Last edited by Pampered-Z; 08-03-2010 at 12:17 PM.
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08-02-2010, 08:01 PM
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#6
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Join Date: Mar 2010
Location: The Pocono Moutains
Posts: 142
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sounds right the oldest one ive ever owned was a 85 5sp z28 and it had both
__________________
run 12s with a JUNK motor!
^^^^^my new mantra^^^
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08-03-2010, 08:18 AM
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#7
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Stalker
Join Date: Aug 2004
Posts: 12,078
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ok, cuz i had stripped a 86 iroc that didnt have the intake pump. the tank is still in my backyard.
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08-03-2010, 10:10 AM
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#8
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Join Date: Mar 2010
Location: The Pocono Moutains
Posts: 142
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if it was a iroc with tpi it had a higher volume in tank pump something around 195lph... if your iroc was a 4bbl, and you mean in tank not "intake" (i thought intake refered to the one on the block)then maybe someone took it before you got to it
__________________
run 12s with a JUNK motor!
^^^^^my new mantra^^^
Last edited by Flippindabird; 08-03-2010 at 10:13 AM.
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08-06-2010, 12:10 PM
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#9
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Join Date: Mar 2010
Location: The Pocono Moutains
Posts: 142
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a little off topic does anyone have any extra Qjet rods and hangers? im gonna need some to dial this thing in when it gets installed
__________________
run 12s with a JUNK motor!
^^^^^my new mantra^^^
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08-10-2010, 04:43 PM
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#10
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Join Date: Aug 2007
Location: Long Branch NJ
Posts: 706
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as far as i know the electric in-tank pump on carbed cars was some sort of recall or upgrade due to fuel boiling/starvation issues. I also had an 85 z28 5 speed and only had the mech pump. You can run a low pressure electric pump under the hood, ive seen it work before, but im not sure how well. That would prob be your cheapest bet
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Formerly known as REED!
JSFBOA
Draino?
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08-10-2010, 05:09 PM
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#11
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Join Date: Mar 2010
Location: The Pocono Moutains
Posts: 142
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i think im gonna do the "wait and see" i have a fpg that will be installed riight in front of the carb to give an accurate read of the pressure the carb gets, if its not enough gm has a "corvette" in tank pump for 72$ its 195lph and is what was used with the old GM H.O. 350(zz4) street legal swap with a regulator like i already have
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run 12s with a JUNK motor!
^^^^^my new mantra^^^
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