Conversions & Swaps LSX Engines in Non-LSX Vehicles
Sponsored by:
Sponsored by:

Electric fuel pump with Lq4?

Thread Tools
 
Search this Thread
 
Old 02-23-2011, 09:17 PM
  #1  
TECH Enthusiast
Thread Starter
iTrader: (2)
 
retardedpenguin's Avatar
 
Join Date: Oct 2008
Location: Pearland, Texas
Posts: 579
Likes: 0
Received 1 Like on 1 Post

Default Electric fuel pump with Lq4?

Can I use just a stock fuel set up with your standard electric fuel pump for a big block in an 80 Trans Am? I always here people modifying their gas tanks and using special pumps but is there any reason why I can't use what I got? The motor is going to be stock for now so I would like to just get it running for now with what I got so I can save some gas vs my big lifted truck.

Can someone help me fuel this thing?
Old 02-24-2011, 06:10 AM
  #2  
TECH Junkie
iTrader: (1)
 
Pop N Wood's Avatar
 
Join Date: May 2006
Posts: 3,402
Likes: 0
Received 7 Likes on 7 Posts

Default

The issue is uncovering the fuel inlet in a turn or when accelerating with a partial tank of gas. The old carb motors could withstand a momentary loss of fuel pressure since they are sucking fuel out of the float bowls.

Lose fuel pressure for a moment with a FI motor and the engine will go lean, possibly during WOT, resulting in potential engine damage.

FI tanks have some sort of internal sump to keep the fuel inlet covered even with a partially filled tank.

Your options to fix it are first getting a FI specific tank, adding some sort of sump or baffle to the existing tank, adding a second pump and a surge tank, or finally just always keep over half a tank when you are going to beat on it.

The last optiion is the cheap and dangerous option.
Old 02-24-2011, 07:08 AM
  #3  
TECH Junkie
iTrader: (1)
 
garys 68's Avatar
 
Join Date: Dec 2007
Location: Camdenton, MO
Posts: 3,706
Likes: 0
Received 32 Likes on 31 Posts

Default

Depends on the tank too. My 68 corvette tank is REALLY deep and even angles toward the bottom where the pickup is. I have not had any problems with an unsumped pickup until well below 1/4 tank.
The wide, flat tank in my 72 442 is another matter.
Old 02-24-2011, 06:02 PM
  #4  
TECH Enthusiast
Thread Starter
iTrader: (2)
 
retardedpenguin's Avatar
 
Join Date: Oct 2008
Location: Pearland, Texas
Posts: 579
Likes: 0
Received 1 Like on 1 Post

Default

So basically it would be ok for a week or two if I don't beat on it and keep the tank full?

Should I get an fbody tank and combine the two?
Old 02-24-2011, 08:26 PM
  #5  
TECH Junkie
iTrader: (11)
 
S10xGN's Avatar
 
Join Date: Jul 2005
Location: Port Neches, TX
Posts: 3,782
Likes: 0
Received 6 Likes on 6 Posts

Default

Originally Posted by retardedpenguin
...standard electric fuel pump for a big block in an 80 Trans Am...
...only puts up 6 - 8 PSI, for F.I. you'll need 45 - 50 PSI.



Quick Reply: Electric fuel pump with Lq4?



All times are GMT -5. The time now is 07:44 AM.