early model walbro pump conversion

[dougie30]

So my external pump is whining and I can feel it cutting out intermediately while driving on the high way so I want to swap out my in tank pump with the walbro 255.

I already read the DIY thread but that is for the 88+ models with the single pump. a few guys touched on the duel pump topic conversion but nothing in depth.

I just need to know what fuel lines go where and if I have to do anything with the wiring? also im not sure how to delete the inline pump? just take it out and connect the two lines?

any help is appreciated.

[McGyver]

you should be able to take out the inline pump by connecting the two lines (you could relocate the fuel filter to the spot where the in-tank pump was), then tape off the wires so they don't short. next, replace your in tank pump with the walboro and you should be golden!

also, i just posted something about the name of an advance auto chinese pump that is actually a re-branded walboro 255LPH pump for $60.

[glnr13]

i'm not 100% positive but i believe there is more to it than just removing the inline pump.

i attempted this with a walbro as an in-tank, removed the inline and ran a coupler. No dice.

i have a 1984 318i, so here were my attempts:
1) walbro in tank + bosch inline = overloaded bosch inline
2) walbro in tank + coupler (inline removed) = no fuel
3) low pressure in tank + bosch inline = perfect

[Van Westervelt]

I have not attempted this at all, but will sometime soon. I think what you are fighting is the dme signal for the inline pump needs to be brought over to the new in tank pump. I will be doing this later this summer.

[Wardie]

I am in the middle of this right now, I didn't even think about it and bought a walbro.

So you just connect the two lines? If you're running MS would this be an issue?
Or what is the correct way to go about deleting the external?

[brahbarian]

Bump on this. Would like to know the proper procedure as my external is whining sometimes.

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[McGyver]

I have not attempted this at all, but will sometime soon. I think what you are fighting is the dme signal for the inline pump needs to be brought over to the new in tank pump. I will be doing this later this summer.

ahhhhhhhh, i didn't even think about the dme looking for the inline pump. do the in-tank and inline pumps use the same voltage/amps/other-electrical-crap?

[Wishno87]

I also have interest in this.

[gotaloveRWD]

I need to replace mine as well
Now why can't we just use a inline walbro?

[Blevins]

I was actually thinking about doing this tomorrow. If I end up doing it I will take a bunch of pictures and stuff.

The size of the line on the walboro pump is different than in the tank, i.e. walbro is like 8mm while the tank unit is 13mm (I think). Also, to remove the inline pump, the lines are the same way. One side is 13mm while the out is 8mm.

Take that with a grain of salt as that is just from looking at the stuff quickly.

Edit: I have an '87 325iS

[brahbarian]

My 87 only has a in tank fuel pump but has a fuel filter where the inline fuel pump would be.
My 85 has. Two pumps and the. Inline is whining.
Could my 87 325i been converted?

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[jlevie]

I have not attempted this at all, but will sometime soon. I think what you are fighting is the dme signal for the inline pump needs to be brought over to the new in tank pump. I will be doing this later this summer.

There is no signal to the DME from the pump(s).

The challenge here will be dealing with the fuel supply hose. 8mm hoses/fittings are used on the later single pump systems, but the twin pump system has 10mm (or 12mm, don't remember which) hoses/fittings from the in-tank pump to the external pump.

[quikveedb2]

Also interested, my external pump is getting noisy. Sub'd.

[TobyB]

...and the 12mm line is not necessarily high pressure.

When I converted mine, I dropped the tank to change the fuel line.
The 12mm stuff was pretty brittle, too.

Also, the wire to the in- tank pump is pretty small gauge compared
to the high- pressure pump. But they are on the same physical circuit,
so I just extended the larger, bigger wire.

And reused the filter bracket.

That's all I remember,
t

[brahbarian]

So basically put in a later model fuel pump and replace 12mm line and upgrade wire?

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