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]

postscript.

went back and re-read my own thread that i posted link to.
its been a while since i rebuilt those pumps.

i thought there was something else the third port does.
it helps with expelling any air in the system and the pump.
if you go to the link i posted above and second page right at the end are some diagrams and a cross section through the pump. the little cylindrical spring loaded valve in the port has a spiral groove in it that lets air bubbles escape down the return port and into the t with the fuel return line from the fpr to the tank.

i guess air bubbles can form in fuel as it cools following shut down. inside the pump and the supply line. so these can escape that way rather than go into the pressurized injector supply line via the delivery port. no doubt helps with cavitation etc. the correct place to put this in the case of EFI cars was in the pump head after pressurization which is really after the fuel supply port. as the body of the fuel pump and supply pprt even though they are full of fuel is not pressurized in one of these roller cell pumps. or it is at least not as pressurized as much as it is right at the delivery port.

whereas in a turbine pump really the whole interior of the pump is pressurized i believe.
so you can do the relief thing and possibly even air bubble relief thing back through the tank supply port.