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

[StarBear]

Weird that it runs only with the AFM disconnected. Usually it will run for 3-5 seconds before the ECU recognizes that there’s no signal. Try diagnosing with AFM connected to get truer feel for what’s going on.

[Nor.Cal.914]

Weird that it runs only with the AFM disconnected. Usually it will run for 3-5 seconds before the ECU recognizes that there’s no signal. Try diagnosing with AFM connected to get truer feel for what’s going on.

I was able to get it to start on its own with the AFM disconnected one time, but otherwise it will not run with it connected. I tried driving it a short distance with the AFM disconnected and as long as there was minimal throttle input it would drive, but the moment there was anything more than about 15% throttle it choked out and died. I don't have access to any wiring diagrams here, looks like a lot of what's out there is missing most of the fuel injection aspect.