NEED HELP: 1974 1.8L Will Only Start with Brake Clean, Runs with AFM disconnected only Options

[Nor.Cal.914]

Hello everyone,

I have a 1974 1.8L that needs a new fuel pump and the customer purchased this pump from Pelican:

https://www.pelicanparts.com/More_Info/0439...59&DID=4630

I have already figured out the line routing in terms of inlet and outlet, but I do have a few questions about some other aspects. Being that the stock pump is a 3-port pump, first question is, what was the reasoning behind the 3 ports instead of just an inlet and outlet? My first thought was maybe an internal FPR, but I see there is a one in the engine compartment so that doesn't seem to be the case, but please correct me if I'm wrong! Second question involves mounting the pump. I have a 1975 so I'm not as familiar with how the 1974's were setup. This car has the coil style ring bracket around the pump which I'm now trying to figure out if I can utilize to mount the new pump. Main issue of course is the fact that all 3 lines came out on one side of the factory pump, whereas this pump has inlet/outlet on either side.

So my question is, what have you guys done to mount your pumps either in the same location or where did you place it instead of the factory location? Thank you in advance for the help! (IMG:style_emoticons/default/beerchug.gif)

-Christopher

[wonkipop]

here is a direct link to the L jet troubleshooting guide jeff bowlsby has on his website that fiacra is talking about.
you can download it as a PDF.
save you a bit of trrouble searching his site.

https://bowlsby.net/914/Classic/zTN_Man12.pdf


there is also a bit here on the type 4 club website.
but this is for the type 4 sedans (411/412).
these were all auto gearbox L jets.
tiny bit different.
but its a good resource.

https://www.type4.org/manuals/ljet/index.html

believe it or not there is a whole detailed L jetronic manual on this website.
i stumbled over it years ago and downloaded it page by page.
but the search function on the website is hopeless.
it was somehow contained in a members file from memory.
i'll try and google search that and see if i can uncover it.

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also on link a couple of posts up i left to factory manuals,
in the electrical volume you will find all the wiring diagrams for the 74 and 75 L jetronic 914s - inclusive of the EFI system. possibly handy to have.

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speaking of your engine photos. (IMG:style_emoticons/default/idea.gif) (IMG:style_emoticons/default/blink.gif)

ok it looks intact.
a couple of questions.
there is a green coloured hose in second photo.
it is diving down the side of the throttle body facing the front of the car.
is this hose then continueing from there to the fuel pressure regulator which is located underneath where the air cleaner box is.' it should be connected. normally this hose is routed around the rear side of throttle body and across tin to FPR, but it appears to be correctly hooked up at other end where it goes into a T connector with the hose from the decel valve. that end looks right.


secondly there is no hose from the vacuum advance can on the distributor to the the advance port on the throttle body. the advance port on throttle body will be on ther rear facing side of throttle body (to rear of car) and sticks up at a 45 degree angle. normally that advance can on dist is connected to that port with a vacuum hose similar in size to the green one i was talking about above. normally that is if its a 1974 49 state car.
however the 74 californians did not connect the throttle body to the advance can. they just tucked the hose of the advance can under the inlet plennum and left it there open.
and there was no port on the throttle body. this car could be a 74 californian model?
have a look at that throttle body and see if that is the case. because if its a 49 state car then it would have an open vacuum leak if that hose is missing.

(another way you can tell if it is a 49 state car or california is see if it still has the emissions sticker in the engine bay. it will be on the left side above the fuse board near the air cleaner. its white with red writing. if it says EC-B its a 49 state car if it says EC-A its a california car.

someone has definitely "restored" this engine or shall we say, dressed it.
the tune up sticker on the fan housing casting is incorrect. its a repro sticker i suspect and its meant for the earlier D jet cars. the L jets had a white sticker with black diagrams and text on it. so someone has been playing around with the engine at some point. to what extent hard to say.

the other thing you want to check is that the vacuum retard hose is there from the distributor to the throttle body. all the different L jets had this.
the retard side of the vac can is the flatter part close to the distributor body.
should be a little port sticking out of it down low. standard it has a green hose runs off it and connects to the throttle body on the forward facing side. the port is down low on the throttle body. the hose is routed under the inlet manifold pipes from the dizzy to the TB.
check that hose is there. photos are too dark and don't show it or i can't see it.


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the manuals i have linked to will tell you pretty much everything you need to know to test methodically.

questions i have - have you pulled the injectors and made sure they are working correctly.

you can find all the tests for fuel pressure itself in the factory manuals and the other manuals linked to.

another point of difference you will find from the 74 to the 75 is that the 74 has a six pin connector to the AFM. 75 has 7 pin. with the 75 they separated out the intake air temp sensor and you can test for that. not so in the 74.

i'd suggest unclipping the EFI harness at the ECU and make sure the pug pin connectors are all clean. clean with eletrical fluid cleaner. same at other end where connects to AFM.

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whats the story with the car. did it run before it came to you?
did someone just think it was the fuel pump that was kaput.
has it been sitting for a long time?