After 15k still problems.

I don't understand the logic that it is a fuel injector leak, if fuel has drained out of the supply side it should quickly respressurise the system when you start, and why would this cause a problem when it was hot but not when cold ? What makes more sense is a vapor lock due to the heat, the pump won't pump vapor, so that would be my guess. When it happens again try quickly cooling it off somehow, a bag of frozen peas on the fuel pump cured old Triumph TRs with the same problem !!

 

Had this problem with my 328. Replace the check valve first, it is cheap ($25). If that doesn't do it, then take it somewhere where they have the equipment to check your pressures. Injectors is possible(leaking into the cylinder, not outside the engine). If yours were never replaced, they are the older Bosch steel injectors, which are known to have problems, and corrode. The other possibles are the fuel accumulator (previously mentioned) and maybe the warm up regulator.

To learn more about how the system works (I think yours is like this one), read this:
http://www.auto-solve.com/mech_inj.htm
Easy to read and really helps to make sense of the FI system on your car.

 

Here is why (remember, I am NOT a mechanic, so may be completely wrong), when hot, leaky injectors basically cause FLOODING, it has nothing to do with loss of pressure (or less to do with loss of pressure). When cold, the extra fuel has evaporated, so it is starting on the "cold start circuit", and all is well.

 

OK yes I see your point, that could be the problem in some cases I agree, my 328 is sometimes harder to start when hot. If it were caused by the flooding then it should be quickly cleared by crancking and maybe with the throttle floored, and you may also expect to smell it. I would guess that the fuel system heat and wear of the parts you mention such as accumulator would be prime candidiates for most of the problems. I plan to install some insulation to try and reduce the heat around the pump and piping areas.

 

Insulation really shouldn't be necessary. You too, have the old steel injectors (if they have never been replaced), it would be a worthwhile upgrade to replace them all with the updated Bosch brass ones.

And yes, upon hot start, if I gave it some throttle, it would always overcome the problem and start.

 

Congrats!

 

Glad to hear you fixed it, can you tell me where you bought the pump and the cost ?