Fuel issues on hot start

[jackmc]

I seem to recall there is some way the Injector Pump accounts for things like heat and elevation. Anyone have any ideas how that works? Some solenoid changes the IP cam to pump more/less? How are these changes detected?

Just a thought. Thanks again for you input!

[ja17]

Very likely that, that after-market fuel pump is the problem.

[jackmc]

Very likely that, that after-market fuel pump is the problem.

Why so? There is now fuel at the IP when the engine is hot, unlike before. I mean, I’ll eventually get the original rebuilt and back in, but I don’t think that’s the issue.

Did you see my question about how the IP adjusts for temperature and elevation? Can you help with that?

Based on the symptoms, it sounds like it’s running way to rich, as opposed to just not having gas or not enough gas.

Thanks in advance!

[rwmastel]

Based on the symptoms, I’m betting my issue is a supply-side issue rather than return or cold start.

However, I still think that is a red herring. .... That’s why I suspected the back flow valve at the fuel pump sticking closed.

It claims to have the same pressure/flow characteristics as original.

All I can suggest is you actually TEST as many things as you can to gather as many FACTS as you can.  People have a hard time helping when there are guesses and assumptions involved.

[Pawel66]

Did you see my question about how the IP adjusts for temperature and elevation? Can you help with that?

To directly answer your question, you have all of it here in the Technical Manual.

Adjustment for temperature: https://www.sl113.org/wiki/Engine/WarmRunningDevice
Adjustment for altitude: https://www.sl113.org/wiki/Engine/AltitudeCompensator

I am not a mechanic, just I do some of the work on the car myself. I think you received a couple of good tips from top experts here to follow and check to confirm/deny certain suppositions and claims.

[ja17]

Check the specs on the fuel pump. Seems that I took one of these off a pagoda some years back. The specs were not even close to being correct, caused all kinds of running and starting problems. There is a Carter Pump which will work, but that is not the one.