engine and drivetrain Fuel Pump

[HenryT]

Hi y'all. I was driving my '76 a few days ago when the power faded out and it would not start. Thinking it was out of gas I filled it up, but it still would not start. I emailed Terry Sayther who had done a service on it a few months ago when I bought it, and he said it was most likely the fuel pump or the points. What would be the best way to go about checking to see if the fuel pump works?

[chadley]

Remove the air filter and watch as someone else tries to start the car while pumping the throttle; or, disconnect the fuel line before the carb, route it into a bottle or appropiate container, and try to start the car and see if fuel comes out (helpful if you have a helper).

All stock? not a Tii?  more info?

Edited September 28, 2013 by chadley

[Beaner7102]

If its a carbed  02, and has the mechanical pump but its dead. They are sill available:

 

Part number 13 31 1 252 506

$117.66 from Max, $95.30 from tomkinsonbmwparts.com or try Blunt for a keen price.

 

HTH Beaner7102

[Mike Self]

If you have gas coming out the accelerator pump nozzle in the carb but still no start, you'll need to troubleshoot your ignition system. 

 

First thing there I'd check is the point gap--make sure it hasn't closed up so they're not opening (when was the last time you put a drop of oil on the felt pad under the rotor?).  If the point gap is OK, then start at the plugs and see if you have spark there, then work your way back to the dizzy and coil. 

 

As my late and sorely missed father-in-law used to tell me, "Mike, 90% of your carburetor problems are in the ignition."

 

cheers

mike

[tbrduc]

I had a similar issue recently. Our '76 would not start.

It was cranking but no fire. I removed the air cleaner and sniffed the carb and watched while I pulled the throttle cable down.

Hmm..no squirt.

I removed the fuel pump thinking the diaphragm had failed. I manually actuated the pump, feeling for pressure on the intake and/or the outlet.

NOthing.

I noticed the top of the fuel pump had a worn spot where the air cleaner was rubbing it. I placed my finger over the out side and blew into the inlet, sure enough, it had worn a small hole and weas losoing pressure.

JB Weld to the rescue.

A fellow FAQer suggested a 'modification' to eliminate the wearing issue.

All done!

[Mike Self]

noticed the top of the fuel pump had a worn spot where the air cleaner was rubbing it. I placed my finger over the out side and blew into the inlet, sure enough, it had worn a small hole and weas losoing pressure.

Had exactly the same problem on my '73 some years ago...the air cleaner had rubbed a hole in the (fortunately removeable) cap that covers the fuel pump filter screen.  I removed it and soldered up the hole, then installed a rubber grommet on the air cleaner to keep that from happening again.  So far so good...but it's something to check if you're still running a stock 2 bb. air cleaner.

 

mike