Doing 4.0 Swap Now..... Need Help Now !!! - Page 5 - JeepForum.com

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post #61 of 157 Old 01-16-2010, 09:10 PM Thread Starter
cevans87
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jsawduste ... for that pump you sent me a link to, i can use externally right ? and also is it self regulated because i'm using the intake off a 2001, fuel rail only has single line...

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post #62 of 157 Old 01-17-2010, 02:17 AM
jsawduste
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Internal and is regulated by an external FPR.
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post #63 of 157 Old 01-17-2010, 03:34 PM Thread Starter
cevans87
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ok, well now that i have the wiring for the engine pretty much figured out... i have pulled and cleaned my fuel tank... i plan on going to the junkyard tommorrow and getting a pump and sending unit out of a cherokee... does anyone know if it's the same and will work...

also i'm getting my vss for a 91 and the harness from it the engine harness....

also does anyone have any suggestions for rewiring my wipers and heater...
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post #64 of 157 Old 01-17-2010, 04:02 PM
dodger889
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A fuel pump out of a Cherokee is not going to fit in a yj tank. Most of these pumps will put out over 75psi you will still need to regulate that to 40 to 45 psi. The part that you are missing will still be the regulator.
If you look you should have a heavy wire that goes to the fan in the xj wiring harness. All you have to do is find the one coming out of the bulkhead connector and hook the two together. Plug that to the fan.

A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
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im just cheap, and cheap makes you creative.
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post #65 of 157 Old 01-17-2010, 04:54 PM Thread Starter
cevans87
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dodger...

on the heater blower... can you go into a little more detail...

my wiring diagrams in my chiltons and haynes don't match my heater switch...

i have 12v at the white wire on the switch but it won't give any to the blower... not sure thats even the wire that needs power...

i got the wiper strightened out...

and what am i supposed to do about a fuel pump? if i can't use one out of a cherokee

after talking to you on the phone (thanks again by the way) i decided the best thing to do would be to get a regulated fuel rail... and a regular 40psi pump and sending unit out of a cherokee seeing as they would both push the same psi and flow rate
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post #66 of 157 Old 01-17-2010, 05:07 PM
dodger889
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ok from the switch if you look over to the passenger side you will where you have about 3 or 4 wires going into the heater box above the vent door that you can see.
If you get a regulated fuel rail then find a pump out yj that will fit into your gas tank.

A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
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post #67 of 157 Old 01-17-2010, 05:16 PM Thread Starter
cevans87
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no yj's in any junkyard around here
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post #68 of 157 Old 01-17-2010, 05:16 PM Thread Starter
cevans87
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i know where the wires are at the heater but nothing is working and i even tried jumping wires
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post #69 of 157 Old 01-17-2010, 05:31 PM
dodger889
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Did you connect the fan wire backup under the battery?

A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
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post #70 of 157 Old 01-17-2010, 05:43 PM
dodger889
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Well then since you all ready have a fuel pump from a xj then figure out where your pickup for the tank is now. Then do some cutting of the pickup tube install the xj pump in there leaving enough room for the pickup sock and run a wire for the pump out of the top to power it. you could use a machine screw and insulate it from the cover to connect it to. Use the sending unit ground and a hose clamp or 2 to hold it in place.
to look like this PartsTrain.com - Hard to Find Auto Parts and Truck Parts -

A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
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post #71 of 157 Old 01-17-2010, 06:12 PM Thread Starter
cevans87
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can i pull the entire 20gallon tank from a cherokee and put it on my wrnagler ?
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post #72 of 157 Old 01-17-2010, 06:14 PM
dodger889
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Quote:
Originally Posted by cevans87 View Post
can i pull the entire 20gallon tank from a cherokee and put it on my wrnagler ?
Nope two different beasts.

A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
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post #73 of 157 Old 01-17-2010, 08:06 PM Thread Starter
cevans87
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ok ... thanks to everyone especially dodger for all the help....

still not done but getting there

i figured out the heater, i didn't have te blower plugged up underneath the battery tray, it's now tied in and working great.

dodger, not to question you... but i have done some reading and in 1988 you could get a 15 or 20 gallon tank. in 1990, jeep offered the 15 and 20 gallon tank option again but this time, it was the exact same tank in both aplications, with the exception of a longer vent hose to cut the fuel flow off at 15 gallons, meaning you could cut your vent hose and achieve 20 gallons...

if a 20 gallon tank will fit , and the cherokee tank is the same size meaning length, width, and height... with the only differance being the front mounted fuel pump why will it not work ?
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post #74 of 157 Old 01-17-2010, 09:09 PM
dodger889
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I not sure but if I remember correct the xj tank is flatter then the yj. Now if you have your out look at it is a plastic tank or steel? The plastic tanks are what are called 20 gal tanks that have a longer fill and vent tubes in them to make them 15 gal tanks easy to modify them to 20 gals. measure your tank before buying an xj tank.

A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
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post #75 of 157 Old 01-18-2010, 08:06 PM Thread Starter
cevans87
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ok so i drove 210 miles today to get the only pum within 250 miles... i have it in and have spliced the green/white stripe wire from the fuel pump relay into my orange wire going to the pump... nothing... am i forgetting something, are there any other wires at the tank that need to be corrected... like the ground ?

check engine light works perfectly too, great idea, and thanks dodger for talking me into it, took maybe 5 minutes to splice in and install
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