Fuel Pumps?

[PipeDreams]

Hey guys been looking for some info! I got an 88 ranger that is getting built up and after going to start it well the pump was dead! I checked the pump in the tank and it was dead as dead can be... now being an 88 it's also got a high pressure pump on the frame! Can I just swap a new high pressure in tank pump and run new lines to omit the one high pressure pump on the frame? I didn't know if guys do this or if the load would be to much on the existing circuit or if it might mess with things... any info on this would be good. I'd rather only have one pump to worry about in the bush then 2 and if I gotta buy a new one any way why not just get a high pressure? Thanks guys!

 

[johndeeregarner]

You really need both. The low pressure pump is to get the gas to the high pressure pump, and the high pressure to the engine. If you OMIT the high pressure pump then your truck won't get enough fuel and will bogg out. Fuel pumps back then just couldn't handle all the pressure in one pump.

 

[PipeDreams]

no no I'm not talking about using just the low pressure pump by it's self... I'm saying if I take the low pressure pump that's blown out and put a high pressure pump in and bypass the one on the frame would that work?

 

[88broncoll]

I cant remember the numbers, but i know the tank pump had considerably less psi than the frame pump. something like 28-40 psi from the frame mounted pump to the rail and i want to say 7-14 psi from the tank?? dont quote me on this , but its only 1/2 or less. Its been a while since i was into mine. But end of story you dont have the PSI for it to work.

I had both pumps sieze up from not being used. But i ended up going to the pick n pull and pulling one off an 88 f150, after i had already gotten the new sender and in tank pump. (BTW, ebay kicked a$$ on price to anything i could find. And i had a couple weeks to wait). anything pre 90 ford is the same setup as far as i could tell. Might have been 89.

mabye someone with an 89 or 90 bronco can say wether they have one pump or two? And if the sending unit and all will swap out from a 86-88 lets say, into an 89-90 tank?

if so, you could theoretically take a 90 sending unit and bolt it in and bypass the rail mounted pump.

Im sure ill get shot down if im wrong, but good info to know when my rail pump takes a crap next time, considering i called the dealer and it was $500+ CAD

 

[holyford86]

the in tank pumps can be bought by themselves, they're about 30 bucks and it's well worth it to just put one in and be done with it.

 

[johndeeregarner]

I got the whole sending unit for 50 bucks. It will just be a waste of time to bypass it. Might as well just do it right. (But thats just what I think).

 

[PipeDreams]

ok I don't know if I'm not being clear enough... But my in tank low pressure pump went and took a shit! Now I found a cheap in tank high pressure pump! So I want to take my low pressure in tank pump out and put in a new in tank high pressure pump run new high pressure lines PAST the pump on the rail (the old high pressure pump) to the filter and call it a day... basically running one pump instead of the stock 2... does that make more sense?

 

[holyford86]

I knew what you meant when I first read it. I still think you should just swap in a new low pressure pump and be done with it. Swapping the high pressure pump into the tank is going to require you to replace the canister type fuel filter with a newer style, and redo all of the lines more or less. Unless you have a parts truck that has all of the lines it really isn't worth the hassle.

 

[PipeDreams]

Ya I figured you did but some of the other responses didn't seem like they did! I don't mind running new line and I can use one of the 2 existing fuel filters on my truck already... I can always buy new replacement filter and run new line... that's not bad and for a trail only truck that's gonna get beat I'd rather do that then have to worry about 2 pumps failing! Thanks for the input guys!

 

[IMenriched]

Thinking on doing the same....just put a high pressure pump in the tank.
ran it past some folks here....pretty sure its been done. thinking Jim mentioned that some of the later bronco II's ran a single intank pump and that there is a way to make the swap like Holyford 86 said....take some new line and fuel filter....& tape off the existing electrical to old rail pump .
then one can mount the filter where you can get at it easier too.

 

[AllanD]

I did it and subsquently eliminated the high pressure pump on the frame.

One serious word of caution, ELIMINATE the reservoir cannister on the frame rail.
if you have a high pressure pump in the tank and eventually clog a fuel filter you can "pop" the reservoir cannister... and gain yourself a SPECTACULAR fuel leak

I pissed 25+ gallons of fuel overboard in about 100miles limping home
like that one evening.

the scary parts is I still had 40-odd gallons in my in-bed tank...
that would have been a file visible from space...

IF you REALLY want to eliminate the low pressure pump swap out the COMPLETE fuel system tank to engine compartment fuel lines
This will also relocate the fuel filter to a spot where it is MUCH more accessable...
The spot where the fuel filter is now

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[PipeDreams]

Well I grabbed a pumpo from a broncoII and tried it out... had to do a little bit of jerry riggin to make the new pump fit on to the new lines but I got it to work... I ran a new pressure line right past the one filter on the rail (return filter) and past the high pressure pump (took it right out) and into the canister filter on the frame up near the front... still easy to get at and from my leak test it seems to be holding just fine! I'll have to see and make sure my pump mod can hold enough pressure but I'm sure it will! Thanks for all the good replys guys!