F.I to CARB - Pirate4x4.Com : 4x4 and Off-Road Forum

jeepkillers · 10-24-2004, 04:44 PM

I just swaped in a 351w (carb)inplace of a 302 (F.I.)What fuel reg. pressure do I need to run?Do I need to install a new one?Where is the best place to install it?Is the top fuel line the supply or return ?
Thanks,

Patrick

Jrod-13 · 10-24-2004, 05:09 PM

what year truck?
dual or single pumps?

jeepkillers · 10-24-2004, 05:20 PM

I put a 1984 351w into a 1989 bronco its a 4 bbl (stock)as far as pumps good what ever came stock on the 89 is still there

Jrod-13 · 10-24-2004, 05:24 PM

well, 89' should be two pumps still, my 89' F-150 was..

all I did was bypass the timer for the intank pump(timer is under the hood)

then unplug, bypass, and remove the high pressue pump on the frame..
5PSI all day long..
My truck has had this setup for 3 years now, I know a few others that did the same.

jeepkillers · 10-24-2004, 05:31 PM

2 pumps.....which is going to be the H.P. pump...and what does the timer look like.when you say bypass do you mean remove or elimanate

Jrod-13 · 10-26-2004, 01:50 PM

the pump on the frame rail will be the high pressure pump

The timer is someplace under the dash. IIRC, the wires are pink.
I want to think that I just ran a wire from the fuse box to the fuel pump power wire after the inertia switch. Looking at the diagram in a chiltons manual will help more though.. It was a few years ago when I did it

jeepkillers · 10-26-2004, 02:07 PM

is the "timer" that you are referring to and the inertia switch the samething? I found the intertia switch,your right it has a plug going to it with a pink wire and a ground wire.Do I just make the pink wire a key on hot wire?

NK · 10-26-2004, 02:27 PM

I could be wrong here but I thought the 89 + models only had the one highpressure in tank fuel pump. If that is the case you will not be able to use the high pressure fuel pump to provide fuel to the Carb. I'm running a low pressure electric fuel pump mounted back by the tank to provide fuel to the Carb., but I did this because I was to lazy to replace my mechanical fuel pump. I didn't switch from FI to Carb. Well I did kind of because I was experimenting with fuel injection on my rig but thats beside the point. Look for a pump on the driverside frame rail. If you can't find one then you have the single high pressure intank fuel pump. It may be possible to use this pump provided you could find a regulator to drop the pressure to at least 6 psi.

jeepkillers · 10-26-2004, 03:32 PM

89 was the last year to use the low pres. pump in the tank,90 is when the started to use the high pres pump in the tank, at least that is what the Haynes book says.
Thanks for the input

10-24-2004, 04:44 PM	#1 (permalink)
jeepkillers Registered User Join Date: Jul 2004 Member # 33787 Posts: 115	F.I to CARB I just swaped in a 351w (carb)inplace of a 302 (F.I.)What fuel reg. pressure do I need to run?Do I need to install a new one?Where is the best place to install it?Is the top fuel line the supply or return ? Thanks, Patrick

10-24-2004, 05:09 PM	#2 (permalink)
Jrod-13 Registered User Join Date: Feb 2003 Member # 17313 Location: Tower, MN Posts: 2,794	what year truck? dual or single pumps? __________________ A recent survay of over 1000 trailer parks in the southeast found the 350 chevy out numbered the mullet by nearly 4:1, draw your own conclusion.

10-24-2004, 05:24 PM	#4 (permalink)
Jrod-13 Registered User Join Date: Feb 2003 Member # 17313 Location: Tower, MN Posts: 2,794	well, 89' should be two pumps still, my 89' F-150 was.. all I did was bypass the timer for the intank pump(timer is under the hood) then unplug, bypass, and remove the high pressue pump on the frame.. 5PSI all day long.. My truck has had this setup for 3 years now, I know a few others that did the same. __________________ A recent survay of over 1000 trailer parks in the southeast found the 350 chevy out numbered the mullet by nearly 4:1, draw your own conclusion.

10-26-2004, 01:50 PM	#6 (permalink)
Jrod-13 Registered User Join Date: Feb 2003 Member # 17313 Location: Tower, MN Posts: 2,794	the pump on the frame rail will be the high pressure pump The timer is someplace under the dash. IIRC, the wires are pink. I want to think that I just ran a wire from the fuse box to the fuel pump power wire after the inertia switch. Looking at the diagram in a chiltons manual will help more though.. It was a few years ago when I did it __________________ A recent survay of over 1000 trailer parks in the southeast found the 350 chevy out numbered the mullet by nearly 4:1, draw your own conclusion.

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10-24-2004, 05:20 PM	#3 (permalink)
jeepkillers Registered User Join Date: Jul 2004 Member # 33787 Posts: 115	I put a 1984 351w into a 1989 bronco its a 4 bbl (stock)as far as pumps good what ever came stock on the 89 is still there

10-24-2004, 05:31 PM	#5 (permalink)
jeepkillers Registered User Join Date: Jul 2004 Member # 33787 Posts: 115	2 pumps.....which is going to be the H.P. pump...and what does the timer look like.when you say bypass do you mean remove or elimanate

10-26-2004, 02:07 PM	#7 (permalink)
jeepkillers Registered User Join Date: Jul 2004 Member # 33787 Posts: 115	is the "timer" that you are referring to and the inertia switch the samething? I found the intertia switch,your right it has a plug going to it with a pink wire and a ground wire.Do I just make the pink wire a key on hot wire?

10-26-2004, 02:27 PM	#8 (permalink)
NK Registered User Join Date: Oct 2004 Member # 37273 Location: Banks, OR Posts: 5	I could be wrong here but I thought the 89 + models only had the one highpressure in tank fuel pump. If that is the case you will not be able to use the high pressure fuel pump to provide fuel to the Carb. I'm running a low pressure electric fuel pump mounted back by the tank to provide fuel to the Carb., but I did this because I was to lazy to replace my mechanical fuel pump. I didn't switch from FI to Carb. Well I did kind of because I was experimenting with fuel injection on my rig but thats beside the point. Look for a pump on the driverside frame rail. If you can't find one then you have the single high pressure intank fuel pump. It may be possible to use this pump provided you could find a regulator to drop the pressure to at least 6 psi.

10-26-2004, 03:32 PM	#9 (permalink)
jeepkillers Registered User Join Date: Jul 2004 Member # 33787 Posts: 115	89 was the last year to use the low pres. pump in the tank,90 is when the started to use the high pres pump in the tank, at least that is what the Haynes book says. Thanks for the input