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Srwilliams 10-25-2016 02:22 PM

Help Locate Return Hose on Fuel System
Okay I am trying to work thru a low fuel pressure issue at the fuel rails after replacing the fuel pump on a 1987 911 carerra. I am not getting adequate pressure at the fuel rails even though my fuel pump is working (new). Bentley provides a good test to determine if the fuel pressure regulator is bad. It provides:

"Relieve fuel pressure and connect pressure gauge to fuel rail (arrow) as described earlier.

The fuel pump is capable of developing a higher pressure than that regulated by the pressure regulator.

— Operate fuel pump without running engine using a fuel pump relay jumper, as described later under Operating fuel pump for tests.

• Check that fuel pressure corresponds to specifications listed in Table b.

• If system pressure is low, repeat test while gradually pinching off return hose. Pressure should rise rapidly. If not, fuel pump is most likely faulty. If pressure does rise, fuel pressure regulator is faulty. See 240 Fuel Injection for replacement information.

Can someone tell me where the Return hose on the fuel line is located that is referenced above, as I want to do this test. A picture would really help me out.

Sorry for the stupid question

jpnovak 10-25-2016 02:26 PM

What car?

Srwilliams 10-25-2016 03:02 PM


Originally Posted by jpnovak (Post 9333468)
What car?

Oops sorry JPnovak. It is a 1987 911

DRACO A5OG 10-25-2016 04:53 PM

It would be the hose with coil around it, right off the Fuel Pressure Regulator.

Srwilliams 10-25-2016 05:24 PM


Originally Posted by DRACO A5OG (Post 9333683)
It would be the hose with coil around it, right off the Fuel Pressure Regulator.

Excellent Draco: I got it now. thanks so much for the picture

BoxsterGT 12-03-2016 02:02 PM


Draco A50G -

If this is your 911, here is a FYI for you and/or others with this same model. Someone has repaired the Fuel Line from the Filter with an incorrect (too long) crimp sleeve.

So long that it has crushed the hose where the 120 deg fitting has a bump. This bump is meant to retain the hose on the fitting under high fuel pressure.

The crimp sleeve must be short enough to NOT crush the hose at this point.

I will look for a photo to show the inevitable results.

Just a FYI for anyone interested.



BoxsterGT 01-03-2017 12:12 PM


Just following up on previous post........

Here is the reason the crimp sleeves MUST be correct or this can happen with obvious results..........

Metric fittings & crimp sleeves are NOT interchangeable with AN or generic English fittings.

I am the only one with "Direct Connect" AN fittings custom made to accept Metric Hose & Sleeves, WITHOUT ADAPTERS.

Please email me for information or to order.



DRACO A5OG 01-03-2017 04:32 PM

Thanks Brother Len,

Not mine, it was liberated off the web. Mine are SS lines now :D

kuehl 01-06-2017 08:09 AM

Or, if you are feeling really flexible, here;

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