Topic: fuel filter swap

[bammerman]

I am running VERY lean by what mech said.  That is why I am about to say screw it and just get a 4.0 tank and pump if they fit in a YJ.  I am way too confused currently on what to do with my YJ tank needing a pump replacement with the XJ 88 engine.

[Jeffy]

I'll elaborate here since someone else might be interested as well.  You remove the stock pump completely.  Then you will need to extend the lines in the tank and extend the pickup line down and add a screen/filter.  The mount an aftermarket fuel pump to the frame or cross-member near the tank.

Another option would be to buy a MPFI sending unit but really you'll be spending about the same for either.  The advantage of the former is that if it ever goes bad you don't have to drop the tank.

[bammerman]

Another option would be to buy a MPFI sending unit but really you'll be spending about the same for either.  The advantage of the former is that if it ever goes bad you don't have to drop the tank.

hate to keep asking but do you have a part number :D

Haven't other people done 2.5 to 4.0 swaps?  I am sure someone ran into this problem.

[bammerman]

http://www.jeepaholics.com/tech/25to40/25to40.htm

This gave me some guidance.  guess I can swap out tank and fuel pump, or try to make out what jeffy is saying :D

[bammerman]

http://www.jeepforum.com/forum/f12/4-0-conversion-83898/

6 or 7 lines down. Is this what you are talking about Jeffy?  

3) The 89 and 90 YJ had return fuel lines already so I just installed an inline fuel filter and pump.



Is this what you are talking about jeffy?  

http://www.quadratec.com/products/55107_99.htm  - it is a 4.2 fuel sending unit.

Or maybe this is more what I need http://www.hesco.us/shop.asp?action=details&inventoryID=43049&catId=7902

[chardrc]

if i recall correctly the mpfi fuel pump may fit in the tbi sending unit (was looking to see if the tbi pump fits in the mpfi unit and the answer was no becasue the tbi pump was bigger in diameter) so reverse engineering that the mpfi pump may fit the tbi sending unit. but doing an inline pump like jeffy said would be easier..

[bammerman]

Well I do not know how to do that :(
but on another note will this fit a 90 YJ

http://denver.craigslist.org/pts/2451822745.html

[sharpxmen]

Well I do not know how to do that :(
but on another note will this fit a 90 YJ

http://denver.craigslist.org/pts/2451822745.html

based on that picture you posted i think you already have the thick rad, so most likely your problem is the mixture - if you fix that you might not need to swap the rad (especially if it's thick).

why don't you measure the core, just stick a toothpick thru the fins and stop when it come out on the other side, keep your finger flush and pull the stick and measure. Or use the visual reference Jeffy mentioned (how much of the tank is covered by the core).

[Jeffy]

Well I do not know how to do that :(
but on another note will this fit a 90 YJ

http://denver.craigslist.org/pts/2451822745.html

No get one that's for a YJ not a CJ.  Stop mixing and matching if you don't want to run into problems.

[bammerman]

I was just following what that one guy did.

http://www.jeepforum.com/forum/f12/4-0-conversion-83898/

Anyone in Denver or by highlands ranch that wants to make some extra cash and help a brother out?

[grumpygy]

Again what year was the 4.0 from.

Seems the one you are trying to copy is a  98 XJ engine

[Jeffy]

Again what year was the 4.0 from.

Seems the one you are trying to copy is a  98 XJ engine

His is pre-1991.  So it's Renix MPFI and not High-Output.

[bammerman]

I measured the radiator.  From when I feel it prick my finger then I marked the other side it is 1 1/4 in thick

[grumpygy]

His is pre-1991.  So it's Renix MPFI and not High-Output.

What I'm trying to say is the link he posted about where he is getting his info is for a later engine not the one he has.

[sharpxmen]

I measured the radiator.  From when I feel it prick my finger then I marked the other side it is 1 1/4 in thick

so you have the thick one, i don't think you need to change it unless it's clogged. fix the pump issue first and go from there.