Basic question - front AND rear fuel pumps??

[baloo]

Heya,
So I'm still mostly in the dark on my 87 3.2 Carrera that once housed a turbo motor. They pulled the turbo motor and put in a stock 3.2, deleting many turbo items (but leaving turbo gauges in place, as well as disconnected lines to the engine compartment.

I had a burned out front fuel pump due to gunk from the tank. So, I'm checking for a rear pump, which evidently is on some models. Can't readily find one.

Do only 930's have front and rear pumps?

Where should I be looking for an additional pump?
Would this be before OR after the rear fuel filter??

Thanks. (I have several more questions about stuff on this car -- posting elsewhere.)

[nickyclyde]

Which is next to the steering rack

[DSPTurtle]

The rear pump is on the driver side just in front of the rear wheel well.

[Flat6pac]

The rear pump is only on the turbo. There is a separate box welded in the left rear of the car for the pump. Turbo engine will run on just the front pump but it would have to be a CIS pump, not a Carrera for the fuel pressure.
Be sure you replace the pump with the correct one because the Carrera can handle the CIS pressure but doesn't need to.
Bruce

[baloo]

Thanks for the feedback from all.

No box found in the engine compartment for a second fuel pump, so no second pump.

[tharbert]

Wheel well, not engine compartment...

[baloo]

Originally Posted by tharbert

Wheel well, not engine compartment...

OK. Would it be behind the inner stone guard in the wheel well? I guess I should just hunt up a diagram...

Well, never mind. Pretty sure only have one pump. I can follow the lines from the fuel filter in the rear, and none of them go into the left wheelwell. They all go to the right,.
Thanks.

[Walt Fricke]

Baloo - have you got this figured out? The 930s had two pumps, one forward, and one mounted on a bracket on the left upper side of the rear torsion tube. The front pump was low pressure, and fed the high pressure rear pump.

Your 3.2 doesn't need all this, so for simplicity you can just put the proper Carrera pump up front, and plumb things in the rear straight through to the fuel filter.

You will easily be able to trace the lines in the rear, and see if you should replace any 930 stuff with 3.2 stuff, or make up adapters from the 930 stuff to the 3.2 stuff. The return line ought to be the same, so it is the supply line which may take some adapting.

[Walt Fricke]

Oh - all the fuel lines should enter/exit the chassis center tunnel in its middle - by the torsion tube. They all are inside the tunnel in that area.

[baloo]

Walt,
Thanks for the details.
Will do a thorough inspection "...wheelwell" location of pump and "...bracket on the left upper side of the rear torsion tube."

The essence of my quandary is that the car was previously set up with a purportedly 750hp turbo engine. This included street roll cage, Recaros, turbo Porsche-VDO instruments (boost gauge, as well as aftermarket turbo timer, 10,000 rpm tach, 220mph speedo), some old-timey computer (from the mid 1990s), bigger brakes, coilovers, even down to putting in "Turbo" labeled door sills, etc.

When the engine blew, they pulled it and replaced it with stock 3.2, BUT LEFT ALL THE HOOKUPS and stuff in place (hence several empty plugs hanging around the engine compartment).

So, since they put in so many Turbo conversions, I wonder IF they added the second fuel pump like the Turbo (since they made so many other conversions mirroring Turbo configurations).

[JFairman]

A Bosch motor sports 0 580 254 044 fuel pump would work well for you. You can buy them here on Pelican parts or do a Google or Amazon search for a genuine one. The prices on them are good because Bosch makes a lot of them. People usually just call them 044 pumps.

There are low quality copies out there made in China so be sure not to buy one of those.
They are original equipment fuel pumps on the 997 GT3.
Bosch 044 fuel pumps have not been made in Germany for a while now. The real ones are made in Czech Republic.
A quick google search brings one up like this and it looks just like original ones I've bought before.
Genuine Bosch 044 Fuel Pump 300LPH SEALED New in Box with 180 Day Warranty | eBay

[Walt Fricke]

I don't know where this idea that a fuel pump was located in a wheel well came from. Porsche never did that. The front pump is on the rear side of the aluminum reinforcing cross member - the thing that holds the steering rack and the rear ends of the A arms.

The one in the rear is on the inside part of the torsion tube.

Shouldn't be hard to figure out what you have, though, and all you have to do is replace the front pump with one - like the 044 - which is suitable for a 3.2.

[JFairman]

On a 911 turbo or 930 the front fuel pump is in between the front cross member and the fuel tank.
This is a Bosch 044 pump in the original mounting bracket.


This is an 044 pump inside a rubber sleeve that fits it like a glove. It's made by Porsche for the 964 and 993 to quiet down the buzzing of the front pump.
It won't fit in the original bracket so I stuffed it into the same location and put a hose clamp around it. Works for me.


The rear fuel pump is in a bracket made for it in between the left rear wheel well and the torsion bar tube. I have another 044 pump mounted there.

[baloo]

JF and Walt,
Thanks for the info.
Well aware of the front pump -- removed it, etc.

I ordered two pumps: a cheap 044 version as well as a Czech-Bosch version.
I'll mount both and get back with results. On both, I'll need an 18x1.5 adapter.

Here are the two pumps -- BTW, the Czech pump was a "Best Offer", and they accepted my much lower offer (if interested, PM me for the price they accept).

Cheaper pump:
Found at
Universal in Tank Electric Fuel Pump 300LPH 0580254044 | eBay




Czech pump. Found at
Genuine Bosch 044 Fuel Pump 300LPH SEALED New in Box with 180 Day Warranty | eBay

[JFairman]

Sounds like you did good on the fuel pump. I paid a lot more than that some years ago for the same ones.
Anyway, for the inlet adapter fitting on the rear pump I got one from BAT in Tampa, Florida.
British American Transfer

The factory fuel filter inlet fittings are also on the factory fuel filters in our cars and everytime I've bought a fuel filter there are new ones on it so I take them off and save them now when tossing an old fuel filter.

Here's a pic of the BAT adapter and a funky old cad plated fuel pump inlet fitting I reused before discovering that the fuel filters have the same ones on them and they are usually in great condition.
I don't remember the part number of the BAT fitting but there are some numbers on the one in this picture.

[Walt Fricke]

I've saved way more of those Porsche fuel filter fittings than I'll ever need. But they are handy sometimes. For instance, I tapped one to take pipe thread inside, and used it to connect to the fuel line before the filter so I could pump the fuel out of the tank should the need arise (such as removing the tank).

But none of my fuel pumps have had a threaded port for a fitting on the intake end. Always just a tube with a boss around it for hose clamped hose retention. I'd prefer screw on fittings, but don't see how one could easily (like without removing tank and filling with water or whatnot so you could weld) attach a screw-on fitting to the tank.