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> D Jetronic help for a new guy please
Wyvern
post Oct 30 2015, 03:08 PM
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Hello .
New here and did search but not finding what I "think" I am asking.

73 1.7 with D jet .... running very rich .
Starts well cold .... flooded warm and again very rich.

I checked the fuel pressure by t-ing off the line just after the drivers side injectors.
I had a reading of 70 lbs .
The pressure regulator seemed suspect to me and was "a bit rough" .
Purchased a new one and still at 70 lbs ???

Help much appreciated . I have read the many write ups by using google but seem to be a bit lost .

thanks for any help / direction
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914itis
post Oct 30 2015, 03:22 PM
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Fuel pressure must be at 30 ponds max . The regulator is adjustable .
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76-914
post Oct 30 2015, 03:33 PM
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Check your return line for a restriction/crimp somewhere. (IMG:style_emoticons/default/welcome.png)
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JamesM
post Oct 30 2015, 03:51 PM
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Is your return line plugged?
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914_teener
post Oct 30 2015, 04:24 PM
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1. Make sure the gauge is calibrated.

2. Like James has said...make sure the return line is not plugged. Jeff Bowlsby has a great diagram on his web site and has posted it here before.

3. Fuel pressure for stock D-jet is 30-32 lbs.

4. Once the fuel pressure is sorted, check the MPS by vacuum check. Harbor Frieght has a "good enough" gauge if you don't have a good gauge with an indicator. Needs to hold at least 15 lbs. vacuum for at least 5 mins. There is a spec for it, I've forgot exactly, but it is somewhere around there.

Report back once you've done these things.
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914_teener
post Oct 30 2015, 04:26 PM
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Whoops....one other thing after you check the MPS diaphram.

Make sure your injectors are not stuck open.

You can have them cleaned and flow checked by someone like Witchunter for about 50 bucks or so.
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Wyvern
post Oct 30 2015, 04:51 PM
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Thanks guys ...
Yes I do have a book, and know to try to hit 30 lbs.
I will check the return line.

I checked every fuel line in the engine bay today .. removed clamps section by section and all were clear.

Am I correct the return is from Fuel pump back to tank ?
If so ... to be %100 sure of being clear is it a removal of tank or can i shoot air through the line ?

Added Jeff's site to my "914 bookmarks"
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Wyvern
post Oct 30 2015, 05:42 PM
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QUOTE(Wyvern @ Oct 30 2015, 03:51 PM) *

Thanks guys ...
Yes I do have a book, and know to try to hit 30 lbs.
I will check the return line.

I checked every fuel line in the engine bay today .. removed clamps section by section and all were clear.

Am I correct the return is from Fuel pump back to tank ?
If so ... to be %100 sure of being clear is it a removal of tank or can i shoot air through the line ?

Added Jeff's site to my "914 bookmarks"


spent some more time ...

Ok ... p-lease don't laugh .
I only have 1 plastic line coming from underside to engine bay ???
My hoses make 1 big loop , right there . I do not see a return line back

(IMG:http://www.914world.com/bbs2/uploads_offsite/bowlsby.net-19245-1446248559.1.jpg)

Where the return should be ( there is a "Y" back to the supply ! )
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JeffBowlsby
post Oct 30 2015, 05:46 PM
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We like photos...show us what you have.
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Wyvern
post Oct 30 2015, 06:15 PM
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this is what my schematic looks like


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Wyvern
post Oct 30 2015, 06:17 PM
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the single feed line


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Wyvern
post Oct 30 2015, 06:18 PM
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& the "Y"


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luskesq
post Oct 30 2015, 06:21 PM
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That explains the high pressure. You need a return line to the tank.

Keith
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Wyvern
post Oct 30 2015, 06:41 PM
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Thanks ... this is odd . just purchased the car from a well known 914 guy . ... car sat for a while .
I am wondering if someone monkeyed with it . & thats why it sat .
I am running on 70 lbs pressure .

I will jack up and see what silly things are at the fuel pump .

Hopefully just correctly re- route the lines .

Thanks (i'll keep you posted ... I just knew I wasn't THAT crazy
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SirAndy
post Oct 30 2015, 07:03 PM
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QUOTE(Wyvern @ Oct 30 2015, 05:41 PM) *
I am running on 70 lbs pressure

Don't ... Unless you like car-becue ...
(IMG:style_emoticons/default/icon8.gif)



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Wyvern
post Oct 30 2015, 07:37 PM
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QUOTE(SirAndy @ Oct 30 2015, 06:03 PM) *

QUOTE(Wyvern @ Oct 30 2015, 05:41 PM) *
I am running on 70 lbs pressure

Don't ... Unless you like car-becue ...
(IMG:style_emoticons/default/icon8.gif)

(IMG:style_emoticons/default/agree.gif)
No Car B Que for me .
I'll check more , but the return line at fuel pump is new & different clamps.

So does that "Y" belong down there on that line with the return from the Pressure Regulator ?
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Wyvern
post Oct 30 2015, 07:53 PM
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QUOTE(Wyvern @ Oct 30 2015, 06:37 PM) *

QUOTE(SirAndy @ Oct 30 2015, 06:03 PM) *

QUOTE(Wyvern @ Oct 30 2015, 05:41 PM) *
I am running on 70 lbs pressure

Don't ... Unless you like car-becue ...
(IMG:style_emoticons/default/icon8.gif)

(IMG:style_emoticons/default/agree.gif)
No Car B Que for me .
I'll check more , but the return line at fuel pump is new & different clamps.

So does that "Y" belong down there on that line with the return from the Pressure Regulator ?


Found this photo here on this forum . the "Y" does indeed belong on the return line at the fuel pump !
(IMG:http://www.914world.com/bbs2/uploads/post-4550-1200837009.jpg)
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r_towle
post Oct 30 2015, 08:24 PM
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Well, if you have a more modern replacement fuel pump, you would not have a need for the y fitting, but you will still need a return line to the tank.

Sorry to say, but you need to buy a line from Tangering, buy both, and replace them to the tank.
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jacksun
post Oct 31 2015, 03:39 AM
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the following is how I installed the stainless steel lines (green) from tangerine...

when I posted this over a year ago, and asked for a critique, no one responded..

I still do not understand the "Y" and how that works. ????

blue is return line..

Attached Image

tks

randal
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Porschef
post Oct 31 2015, 07:09 AM
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I'd say you've been nothing short of lucky to this point; Andy is 100% correct. Please don't drive the car until you redo the fuel lines completely and get rid of that nylon line... I'm sure that thing is as brittle as hell, mine looked rather like that and snapped when I bent it.

Best thing you can do for your car at this point.
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