heidizzy distributor woes

[Trollhole]

Take the gas cap off and then take fuel line off from fuel pump inlet side and blow some compressed air in it.

Most likely you have a fuel restriction in your tank. If this works. Take tank out and clean the crap out.

 

[olymon]

Thanks for all the sugestions on the possible cures to my problems. I've got to put some major time in on this rig this weekend. I was going with the rotor facing at the #1 cylinder idea because of a distributor I dropped in an older chevy before. Never had this much trouble just trying to keep it running in the past. I guess letting it sit for two years while I messed with new house stuff was really bad for it.

 

[olymon]

The tank was lined a few years back so unless the inside is peeling the tank outlet to the fuel pump should be nice and open. I'll give it a try anyway, it really can't hurt anything. How about a stuck vent on the gas cap?

 

[bsevans]

What year is your vehicle? 10/77 to 9/83 did not use a vented gas cap. Not sure about 10/71 to 9/77.

 

[olymon]

Yeah it's a 77. The only reason I thought it had a vented gas cap is because there is a tiny spring in the center of the cap on the inside?? Probably there so the tank doesn't create a vacuum.

Well, I got the distributor positioned so that I could get quite a few degrees of rotation out of it. I can get the timing set no problem now.

I had a problem with low fuel flow still. I remembered that when I was checking the fuel pump out I questioned the gasket on the top of the fuel pump. It seemed like the pump gasket could move up and down with the diaphram like a slave. So, I thought I would cut out the excess gasket and see how the fuel flow reacted without the gasket soaking up so much pump diaphram movement. The flow increased quite a bit and seemed to be more of a steady stream. So, I chalk up my problem of low fuel flow to the gasket.

 

[FJ40Jim]

All vehicles have a vented gas cap. Newer vehicles have a spring loaded vent valve that will only admit/expel vapor when the tank reaches a certain pressure differential.