84 inline fuel pump

[tbrody]

I have been searching and doing my due diligance and learned alot but have not found the answer to my question so really I just need a simple answer if possible, since alot of information does exist.

My question is if I want to upgrade to a external inline 255 lph fuel pump, can I simply replace the existing inline pump keeping the in tank pump as is or will this not work. If not is there an easier way to get to a 255 lph set-up without taking off the tank and putting in a single in tank pump. Thanks!

Tom

[BrianO]

it's cheaper and a lot easier to just do the 255 in tank. with everythign in hand it would take just a few hours.

weren't you the one that said you didn't have a pump in the tank and only ahd the external OEM one? I think Mike had said they are designed to work together. with out the intank one the external will work harder and get much louder. the in tank one just makes sure the external one always has fuel to push to the motor..without it, the external has to pull and push at the same time wearing it out in time.

I'm curious how you get fuel from the bracket with no pump in there.. I assume a rubber hose is hitting the bottom, but with no strainer?

[tbrody]

Still have the same question

Previously I was surprised to hear the car had 2 fuel pumps, my other car that was wrecked I had the gas tank laying around. One of our members posted for a sending unit which I sent him from the tank I didn't want, I didn't remember a pump being there but wasn't really looking for it, I also sent him the fuel level assembly they both came out of the holes in the top of the tank. I have sent him a PM asking if the pump was there but he hasn't answered me.

I don't know the full history of my other car that I am now questioning, but the external pump is visible by the frame, so for me it would be cheaper to just replace it since I already have a pump and wouldn't have to drop the tank, can I simply swap external pumps. The car does run so I don't have to do it but thought it couldn't hurt with some major performance upgrades over stock.

[BrianO]

don't see why not, just have to find a 255 external.. I'm sure they are available. sounds like you have one already. go for it.

don't feel bad, I don't know the history on mine either..I'm writing my own history each day with it.. lol

[Pat_in_L.A.]

Yes you can swap just the external pump. 84-85 has two pumps, and 85.5-86 has one in-tank pump.

[Eyelawdoc]

Make sure you use the genuine Bosch OEM pump to replace your high pressure pump and not the generic Mastercraft pump which is a POS.

The Bosch pump is still available at Napa. The part number is N69100.

[tateg]

If you want a 255lph inline pump you need one of these, not the Bosch. It's what I'm using. And yes, the intank pump is half the price.

http://www.ronmorrisperformance.com/miva/merchant.mvc?Screen=CTGY&Store_Code=rmp&Category_Code=Fuel_pump

[rodney_nelson]

Or you could always get one of these:

http://apeusa.com/?external

The GSL392 is the application. They even have a kit so it is a drop in. I'm going to be doing what you're talking about fairly soon as well so I don't have to drop the tank.

In fact, the guys on TF have discussed that this system might work more efficiently anyway.

[tbrody]

Thanks so much!!

This is exactly what I needed, this is the pump I have the GSL 392. This last site sells all the fittings individually, these are not easy to find. Does any one know the proper fittings for inlet and outlet off hand.

Thanks to everyone for your responses this should be an easy switch!!

[Eyelawdoc]

Many may not know this, but the original Bosch pump flows more than the Walbro GSL 392, costs less and comes with all the fittings needed for a bolt- in install. The GSL 392 will work fine and is a good pump, but don't be fooled into thinking you are gaining anything with it.

[rodney_nelson]

Many may not know this, but the original Bosch pump flows more than the Walbro GSL 392, costs less and comes with all the fittings needed for a bolt- in install. The GSL 392 will work fine and is a good pump, but don't be fooled into thinking you are gaining anything with it.

Got any numbers to back this up? I find it hard to believe that the factory part outperforms a high-performance oriented piece. Especially since numerous people have used it with great results.

If this were true, the people who switched to that pump would still be running lean into the higher boost levels since 90% of the people you talk to suggest to upgrade fuel pumps as one of the first things.

Not trying to argue but I'm actually interested in this, since if this is true I may not have to shell out the $140 I thought I had to (the Bosch unit was replaced 3k miles ago).

[Eyelawdoc]

Many factory parts on the SVO outperform so-called "high performance " aftermarket parts.

Pat Pearson several years ago built a test unit to check out what he thought was a faulty fuel pump. It allowed him to vary the pressure loading on the pump while measuring fuel flow rates. For fun he tested a 20 + year old stock Bosch SVO pump and it flowed more fuel at higher pressures than the much touted 255 lph Walbro .

Ford engineers overdesigned the fuel pump system on the 84-85 SVO.

Having said that, the Walbro pump is a quality pump also and will serve well as a replacement for the Bosch pump.

You may want to check with the vendor of your Bosch pump as you might have a warranty replacement claim for the faulty unit.

Most ofthe people out there advocating the fuel system "upgrade" for the 84-85 SVO simply don't know the facts.