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06-21-09, 09:51 PM
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 #1 (permalink)
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Forum Regular
Join Date: Mar 2005
Posts: 54
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Replacing a fuel pump on fj40
My mechanical fuel pump on my 78 fj went out and I was about to get ready to change it out. What I thought was going to be an hour or so looks like it is going to take alot longer then that. I was wondering if it would just be better to put an aftermarket electric fuel pump on it instead of the stock mechanical one. Does anyone have any thoughts on this? Thanks, RG
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06-21-09, 11:16 PM
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#2 (permalink)
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Site Addict
Join Date: Apr 2007
Location: Albuquerque, NM
Posts: 1,972
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Our '79 FJ-40 had the mechanical pump replaced by a simple electric pump. Worked fine. I didn't even realize it until I took the truck apart, that's how well it worked.
Just wire it to switch on with the key, and you'll be good to go.
Dan
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06-22-09, 12:01 AM
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#3 (permalink)
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250+ Club
Join Date: Mar 2004
Posts: 527
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The mechanical pumps last a very long time. I would replace it with an OEM. Good for another 30 years.
Should be a fairly easy process. I think it's two bolts and a pair of fuel lines and you are done.
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1978 FJ40
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06-22-09, 05:19 AM
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#4 (permalink)
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GIGGIDY!!!
Join Date: Dec 2006
Location: SC
Posts: 4,361
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Quote:
Originally Posted by Robert LaDuke
The mechanical pumps last a very long time. I would replace it with an OEM. Good for another 30 years.
Should be a fairly easy process. I think it's two bolts and a pair of fuel lines and you are done.
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x2
What is taking so long with the replacement?
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06-22-09, 05:44 AM
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#5 (permalink)
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Site Addict
Join Date: May 2006
Location: erie pa
Posts: 1,482
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unless you buy a good electric pump forget it .oem is best and its a half hour job to change for most people .unhook 2 fuel lines maybey 3 remove 2 bolts ,clean gasket surface and replace.i think your making this more diffucult than it needs to be .how long will it take to cut lines run wires and mount the electric pump right. your choice good luck
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64,65,69,69,70,73,77 fj40s wagon and pickup sold
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06-22-09, 08:05 AM
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#6 (permalink)
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Site Addict
Join Date: Mar 2003
Posts: 1,935
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On a 78 there should be two lines, one rubber one hard.
Undo two bolts pull it out. Not much to it.
Buy a new gasket for it as well.
The 78 pump is rebuildable and can be torn down and rebuilt if needed.
Dave
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"The time has come" the Walrus said," To talk of many things.."
In the Trees.... OH
80 fj40, 2.5 OME Dakaar springs, 33" bfgs. "Charlie Brown"
88 fj62 Bone stock, Daily Driver, Bone stock. "Moby"
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06-22-09, 08:13 AM
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#7 (permalink)
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Site Addict
Join Date: Feb 2005
Posts: 1,140
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Quote:
Originally Posted by Robert LaDuke
The mechanical pumps last a very long time. I would replace it with an OEM. Good for another 30 years.
Should be a fairly easy process. I think it's two bolts and a pair of fuel lines and you are done.
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X 3
Plus, if it takes you longer than an hour to replace the mechanical fuel pump, it'll take you even longer to remove it, mount the block-off plate, mount an electric pump, and figure out how to plumb it.
Quote:
Originally Posted by DanS HJ-45
Our '79 FJ-40 had the mechanical pump replaced by a simple electric pump. Worked fine. I didn't even realize it until I took the truck apart, that's how well it worked.
Just wire it to switch on with the key, and you'll be good to go.
Dan
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Not so much. That'll work, but there's a safety issue -- you don't want the pump fire-hosing fuel all over the place after you wreck and sever the line to the carb. Most EFI set-ups have a circuit that shuts off the fuel pump when it detects no ignition events.
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06-22-09, 10:01 AM
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#8 (permalink)
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Forum Regular
Join Date: May 2009
Posts: 160
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Quote:
Originally Posted by DanS HJ-45
Our '79 FJ-40 had the mechanical pump replaced by a simple electric pump. Worked fine. I didn't even realize it until I took the truck apart, that's how well it worked.
Just wire it to switch on with the key, and you'll be good to go.
Dan
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I'd opt for the 1 hr. stock replacement option.
Most electric fuel pumps are designed to push fuel so you'd want to mount the pump on the frame rail back near the tank. Wire in a manual safety shut-off switch in the cab as well. Use something big and easy to hit when you're upside down.
Quote:
Originally Posted by PHAEDRUS
The 78 pump is rebuildable and can be torn down and rebuilt if needed.
Dave
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Where? Where? Where? I recently had to replace my fuel pump because I couldn't find a rebuild kit.
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06-22-09, 12:09 PM
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#9 (permalink)
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Forum Regular
Join Date: Jul 2008
Location: Kuwait-Middle-East
Posts: 19
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Just replaced my Fuel pump Yesterday went out to shop for one all i got is a 3F fuel pump so i got it plugged right in and Now it works perfectly 2 bolts and some hoses and your done
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1982 FJ40-Metal Gear Edition (off roader)  
2005 Chevrolet SSR 6.0L (once in 2 weeks)
2004 Chevrolet silverado RST (once a Week)
2008 Mercedes benz SLK 350 (Nightly Driver) 
2009 Caprice SS 6.0L (Daily Driver)
2005 Lexus LS430 (daily Driver) Sold
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06-22-09, 12:17 PM
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#10 (permalink)
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Forum Lifer
Join Date: Oct 2007
Location: Plano texas
Posts: 2,526
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Replace with mech.Toy. should take less than 1 hour. Mike
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Mike Hanson
1982 FJ40
1987 FJ60
3 x 1988 FJ62
1989 FJ62
1991 FJ80
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06-22-09, 12:19 PM
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#11 (permalink)
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Forum Regular
Join Date: Jul 2008
Location: Kuwait-Middle-East
Posts: 19
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definitely under hour of work
__________________
1982 FJ40-Metal Gear Edition (off roader)
2005 Chevrolet SSR 6.0L (once in 2 weeks)
2004 Chevrolet silverado RST (once a Week)
2008 Mercedes benz SLK 350 (Nightly Driver)
2009 Caprice SS 6.0L (Daily Driver)
2005 Lexus LS430 (daily Driver) Sold
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06-22-09, 09:43 PM
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#12 (permalink)
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Forum Regular
Join Date: Mar 2005
Posts: 54
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I will look at it again. I know the 2 bolts are all that hold the pump on but it was the other stuff like the battery box that looked like it was in the way. I will look again and check if I just saw it wrong.
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06-22-09, 11:21 PM
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#13 (permalink)
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250+ Club
Join Date: Mar 2004
Posts: 527
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If I recall correctly , I think I found the pump is easiest to get at from bellow.
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1978 FJ40
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DanS HJ-45
