So going through old threads, and i see I completely missed your original questions. Dunno how that happened.

On my 89 I am using a high pressure intank pump for a 90 model year, along with my on rail pump. My tank started leaking, so I replaced it with the tank from a 90 model year parts truck, complete with pump. Took all the measurements, and the 2 tanks were identical. replaced the tank, and 2 weeks later the "new" old pump died. Replaced it with a brand new one, sourced for a 90 model year, and has worked great for me ever since. I have no idea if my on rail pump even works any more, but the truck fires up just fine whenever i need it to.

 

I'm getting ready to replace both pumps in the tank...I started searching and found this. great minds think alike, I didn't even remember making this until I found it and started reading


I need to buy a new front tank, so I think i'll buy a tank/pump assembly for the newer fuel system. I want to get rid of the old system so I wont get stranded if the in line goes bad....one good thing about the dual tanks is the ability to have a "spare" fuel system already in place.


any issues that have been found by those that have done this, please share.


for now, ill leave my in-line pump in place and pull it if it causes an issue. the consensus seems to be it wont be a problem, whether its running or not.

 

still runnin strong?

 

I was thinking of doing the same. I have a tank out of a '90 Bronco I was going to use.
I'd like to delete the wiring for the front pump, though.

 

Yup, fired it up just last week

 

Just had to replace my rear tank fuel pump. $600. I wish I knew what aftermarket pumps i could use and set up yet no harm to performance.

 

Since I see nobody answered this part no you cannot put the new style fuel pump in the old style tank. I personally tried it with no luck.
Trav

 

this is something I was curious about. I was going to start with a new tank/pump assembly (hope I can find something that isn't junk) for the newer trucks. I need a new front tank anyway, big gash in the side from driveshaft puncture wound. my rear isn't in too bad of shape, but theyre pretty cheap so I wouldn't mind replacing it.


just curious, what makes them incompatible when attempting to swap?

 

For some reason it his the front if the tank (toward the cab when installed) plus it seems like it isn't quite as deep.


The fronts will swap but not the rear.
I have an old style fuel pump in a 90 tank on my 88. I am waiting to install the correct rear tank since it won't work unless I do like you say but I have no reason to.
Trav

 

ahhh. thanks for the info.


too bad my rear tank isn't the one that's destroyed then....but oh well. figure I freshen it all up with new tanks and make my life easier in the process. all clean stuff to install, no crusty fuel tanks to wrench on, and I pop a hole in the tank and drain the gas too if I get the tank/pump combo.....

 

no problem man.
Trav

 

I know this is an old thread, but am very interested in doing the same to my 1989 f350.

I started with issues with the Dual Function Reservoir (which I am sure you do away with in the upgrade because of it's pressure sensitivity) finding it hard to find 3/8" fuel line connectors to replace the ones with torn/missing O-rings... so...
and found this thread.

It may be much easier to just go this route, instead of fighting the existing system?

I have researched this a little, and found that Walbro fuel pumps come highly recommended.
I found they build 'Universal' models that only replace the existing in-tank pump, leaving the rest of the assembly intact... so no need to replace the tank to a new model.
The price is right too!
The 255LPH model should work?
https://walbrofuelpumps.com/walbro-gss-fuel-pumps

They even have a 450LPH in-tank pump for 750+HP engines!
https://walbrofuelpumps.com/catalogs...esult/?q=f9000

And lots of accessories, such as in-tank strainer filters, wire harnesses, and other needed hardware.

Would all I need for this is to replace the in-tank fuel pumps, swap the Dual Function Reservoir for a universal tank/valve switch (with new switch at dash) and swap needed fuel lines/connectors?

EDIT:

Looked more thoroughly on the Walbro website and found in-tank pumps made for 1989-1997 Ford trucks! MADE IN USA too!
Ford F53 - 1997-89 8 Cyl. 7.5L Walbro OEM Fuel Pump Full Assembly Module - PN# TU205

These I assume are for the post 1989 trucks.

 

Somewhere, perhaps NLOC web site (Lightning Onwers), is info on using both pumps at the same time to boost fuel pressure. One of FTE's older members once described it but I have no details on how its done.

(Edit. Oh crap, thread mining & fell for it )

 

You weren't the miner, you just followed him into the mine.

I've since discovered the factory fuel pumps are quite adequate for our low rpm small block builds...which makes sense considering they fuel 460s as well.

 

Richard: good quality oem replacement high pressure pumps are sufficient for anything except high rpm (6000+?) or boost.

The high pressure pumps have check valves built into them, when they receive back pressure from the other tank, they close. So you needn't do anything fancy in that regard, you do have to get rid of the dual function reservoir, the increased pressure will eventually cause the unit to fail altogether and keep fuel from flowing through it, been there.