Fuel lines Fuel Injection

[Ginger pig]

Afternoon all,

Has anyone had any success finding alternative fuel lines (they look to be Nylon) that feed the fuel rail?? I was looking at SJ’s and can’t find them so believe that at least some may now be obsolete??? They certainly seem to be bent in some funny shapes and look to be heat shrunk onto the respective connectors. Has anyone tried to replicate these at all?

cheers

Mark

[CarBuff]

I'm not an expert on GM MPFI, but some owners have installed stainless fuel line (both with and without the flex 'loop'). If you can find the owners then you can determine which fittings you need to connect.

[AndyPG]

14 hours ago, Ginger pig said:

Has anyone had any success finding alternative fuel lines

Hi Mark,

If you search "fuel lines" or similar, in this section, there's quite a few threads re alternative pipework.

Andy.

[Chillidoggy]

Mark, the black nylon fuel lines are NLA. And they’re very difficult for an amateur to form. I looked into doing it but chickened-out when I saw how difficult it was.

So, when I replaced them during the engine rebuild, I used black, nylon-covered rubber with the same ID, available from a variety of sources, and fabricated a new hose bracket for support. I used the original fittings, O-clips and fuel line clips.

You could also use Aeroquip-style hose and fittings. 

[Ginger pig]

Thanks guys, might see if there are any plans from the independents to remanufacture these.

Ian, I quite like your solution!👍

cheers

Mark

[Chillidoggy]

59 minutes ago, Ginger pig said:

Thanks guys, might see if there are any plans from the independents to remanufacture these.

Ian, I quite like your solution!👍

cheers

Mark

I know PNM had no plans to remanufacture them. Pete said he thought they were “crap”. So that’ll save you one phone call, at least!

[Ginger pig]

Hahaha... that sounds like something Steve would say!!!

The problem is I’m not a big fan of the pink a blue aeroquip fixings...

[DMEARC]

I know I’m a bit late to the party but I thought I’d add my fuel line story. My recently acquired 90SE was still rocking the original fuel lines. After looking around at what others had done to solve this problem, I decided to go the easy route and use fuel injection hose. Specifically, I used Gates Barricade #4219BF in 5/16” size (7.92mm), and ABA #21014 clamps. I used this combo to replace all of my fuel lines, including the return line.
 

A few notes for those that are contemplating this route:

The workshop manual suggests disconnecting the fuel pump wiring as part of the process for depressurization of the fuel system. Instead, I pulled the inertia switch plunger as the car was running, then cranked the engine for an additional 3 seconds after it ran out of fuel.

There are two fittings that I did not remove from the engine: the fuel injection rail inlet fitting (GM says you can’t remove this one without ruining it) and the return fitting under the pressure regulator (I saw no way of removing this one). So both of these fittings had the old line cut off and the new line installed in situ.

There are 4 o-rings that should be replaced as well: 1 on each of the fittings on either side of the fuel filter, and 1 on each of the fittings for the secondary injectors. They are all the same size. I purchased a small kit of assorted fuel injection o-rings (Dorman #90100) that had a half dozen or so of the correct size.

You should replace the fuel filter as well. AC Delco #GF652. 

Although the 5/16” hose works just fine for the entire fuel system, I do believe it is just a tad bigger diameter than the stock return line. I say this because it slid very easily onto the return fitting under the pressure regulator and the return line adapter at the fuel pump. Every other fitting it was a bit of a pain to push the new line on. That being said, the new return line does not leak nor are there any fumes. 
 

Overall I’m very pleased with this solution and the total cost was about $60.