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Fuel Pump Install (Walbro 255LPH)

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Fuel Pump Install (Walbro 255LPH)

Old 01-16-2009, 01:43 AM
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Default Fuel Pump Install (Walbro 255LPH)

Heres a little DIY for people looking to install the walbro 255lph fuel pump for their scion tCs.

Things Needed

1. Standard Tools
2. Dremel


Start off by taking off the back seat cushion, you need to access the fuel pump through the inside of the car, once the back seat cushion is removed you will see a disc plate w/a power line running into the middle.

For this part simply take a flat head screwdriver and begin to pry up the disc plate, its held down by a black sticky takdont jump the gun and grab a blow torch here guys this is not the oil panit comes off quite easily. Place the screwdriver on the lower left side, its the best angle, pry up and itll come right off.


Remove all connections, and screws surrounding the lower (black) plate below the plate that was sealed by sticky tak


Once everything has been disconnected, take the fuel line and ziptie it somewhere on your car w/ the line facing up so fuel does not shoot all over your car while you work on the pump.

Lift up the pump gently and be careful not to break anything when taking out the housing.

Once the entire housing has been removed from the car disconnect the top and bottom part of the housing, held in by clips, disconnect the power to the fuel pump and with a little push the fuel pump should pop right out.

With the stock fuel pump in hand, remove the clip, rubber ring, and tip from the top of the fuel pump (side where fuel line / power). Loose the tip that was on the stock fuel pump you dont need it, reposition the clip and rubber ring to the walbro fuel pump.clip goes first then o ring on top, just as it was on the oem fuel pump.

Here is the stock fuel pump with everything removed.





Now cut the wires found in the top portion of the fuel pump housing and wire the new power chord. You get provided with the necessary wiring parts (mines from dezod, but if you get it from somewhere else Im unsure if it comes w/ these parts) but I chose to solder mine here is a picture.



Once you are finished with the wiring place the walbro back into the fuel pump housing, just as the stock one went in, be sure to have the proper fittings on the pump. Plug in the newly wired power source, and assemble to top part of the fuel pump housing. Dont forget to place the new fuel filter on the walbro.

The tricky part, the bottom of the fuel pump housing.

The fuel pump has a stock rubber bushing that is much smaller than the one found in the walbro, not only that the bottom half of the fuel pump housing will not clip back in place because of its longer size. What you do is dremel away an opening so the fuel pump can snap back into the housing.




this gives you an idea as to how much you may have to cut. Just be careful not cut away too much, you need something to hold it in place. I chose not to use the rubber piece that came w/ the pump because it just made the pump harder to fit, you cut away the right amount that pump will go in there nice and snug.

Since pieces of the housing were cut, and me being paranoid I decided to get a zip tie and fasten it around the outside of the housing surrounding the clips that snap the unit back into place.

Heres a picture.



make sure all clips are attached and reinstall the fuel pump.
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Old 01-16-2009, 01:51 AM
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good job, nice to have a diy on this. I hope this thread doesnt get lost......

someone throw this biznatch in the tec section
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Old 01-16-2009, 01:53 AM
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btw im not sure but idk if that zip tie will hold up to gas....I would think that gas would melt plastic like that....could be wrong though.
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Old 01-16-2009, 01:54 AM
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nah, its plastic just like the material that holds the fuel pump
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Old 01-16-2009, 01:56 AM
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good write up. thanks for the info!
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Old 01-16-2009, 01:57 AM
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I know this is probably just for turbo rides, but what does the fuel pump do again?
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Old 01-16-2009, 01:59 AM
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Originally Posted by InfiniteVisi0n
I know this is probably just for turbo rides, but what does the fuel pump do again?


pumps fuel to your motor....
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Old 01-16-2009, 02:01 AM
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so this wouldnt be pointless if I didnt have turbo?
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Old 01-16-2009, 02:03 AM
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Originally Posted by InfiniteVisi0n
so this wouldnt be pointless if I didnt have turbo?
only if you had a fully built n/a motor at 2.7 litr w/ a 125shot o nawz
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Old 01-16-2009, 02:23 AM
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good info, seems like my 550 injectors are a lil short without these
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Old 01-16-2009, 02:41 AM
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Nothing needs to be said.

A fuel pump's function is to pump fuel. Got it? Useful enough?




Crayola - much apologies for my foolin' with this kid. Great write-up. I hope a mod stickies it and erases all this nonsense of what a fuel pump does.. lol
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Old 01-16-2009, 02:53 AM
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But yeah a simple explanation of upgrading a fuel pump especially on boosted engine is that it improves the quality spray of the injectors which will result in better burn..

Imagine you are trying to mix/push air and fuel into the cylinder, if you have way more air pressure (boost) than fuel pressure in the cylinder it will result on a bad quality spread (bad mixture) or using stock fuel pump on high boost will result to leaning out since the amount of boost pressure will suppress the fuel spray from making its way to the cylinder.
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Old 01-16-2009, 02:56 AM
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oh thanks
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Old 01-16-2009, 03:01 AM
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Old 01-16-2009, 03:23 AM
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lol thanks for comments guys..........

hopfully this will get thrown in the tech section, reason i did this is that it bugged me so much that there isn't a single DIY on the pump anywhere

hope the mods keep the what is a fuel pump nonsense lol forgot to put what a fuel pump does on teh write up
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Old 01-16-2009, 03:32 AM
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Anyone know if the "install kit" that is listed with this product on Dezod site is something that Dezod does or it that something that comes with the Walbro pump?
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Old 01-16-2009, 04:04 AM
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Originally Posted by yamaha16bw
Anyone know if the "install kit" that is listed with this product on Dezod site is something that Dezod does or it that something that comes with the Walbro pump?
its got to be somthing that comes with the pump, i got mine from dezod and it came with the the instal kit and it is not in any way tC specific. the pump came with a rubber line 2 mini clamps new fuel filter w/ ring for filter, and instructions for instal on a bunch of different types of universal fuel pump setups, not instructions for
our specific car. all u need from the package is pretty much the pump the power line and the fuel filter w/ ring
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Old 01-16-2009, 04:29 AM
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Ahh i c. thanks again for this info!
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Old 01-16-2009, 07:59 AM
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How much louder is this pump over stock?
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Old 01-16-2009, 10:42 AM
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Originally Posted by B_Real45
Nothing needs to be said.

A fuel pump's function is to pump fuel. Got it? Useful enough?




Crayola - much apologies for my foolin' with this kid. Great write-up. I hope a mod stickies it and erases all this nonsense of what a fuel pump does.. lol
sorry had to sig ya

and yeah id like to know if its any louder than stock and did it make your current set up run richer than before.......some have said that it may.
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