Talk Morgan Forums Morgan Sports Cars Morgan Three Wheeler & Super 3 Morgan 3 Wheeler Trouble Shooting HELP

My 3 wheeler is running again. No clear root cause was identified, however I pulled the injectors, tested and cleaned them. Fuel pressure was verified at 70 PSI and the fuel system was purged. Spark plugs were pulled and replaced (passenger cylinder was slightly rich but not bad), spark plug wires/boot were cleaned and lubed. Once all back together it fired right up and is running without issue.

Thanks for the support.

Another example of the endless Morgan mysteries. It could have been only one thing, or a combination of many to test your mettle. You will probably never now until the next time a new one comes along to keep you busy and the rest of us entertained. Enjoy the ride!

I'd echo Planenut's suggestion that something like the Throttle Position Sensor (TPS) being affected by prolonged non-use/ storage may have been the cause...

The fuel pressure should regulate to 58 psi, not 70. It could be your gauge that is at fault though?

Update, my problem continues.

I pulled the fuel injectors, cleaned and flow tested them. Both produce a good mist pattern with no streams and have equal flow. Fuel pressure was checked and I'm getting 70 psi at the injectors. Fuel was flushed and everything verified to be clean. Finally, I replaced the spark plugs for good measure. After doing all this the Morgan started right up and ran fine for about 30 min before suddenly shutting down again. When I attempted to restart I did not hear the fuel pump pressurize, although I could hear some percolating sounds I'd not noticed before. I'm guessing that may be the fuel return??? There are no dash warnings. If I let the Morgan sit for a while and restart, I hear the fuel pump pressurize and it starts right up and will run for a while before shutting down again... rinse and repeat.

Any suggestions are welcome.

Thanks,

I say again, fuel pressure at the injector test point should be regulated to 58 psi, suggests the filter/regulator isn't doing its job correctly.

I do agree with Ian - Planenut - Take a better view to the filter.

The filter regulates - at the end of the fuel line system - the requested 58 PSI back pressure for the fuel.
When the filter is really clocked you will see High pressure.
So it really looks like you have a very dirty filter.
Far better is to change the system.
Install after the injectors a real fuel-pressure regulator from f.i. Fuellab # 51501 and keep it on 4 Bar - 58 PSI. You can install a gauge on it. Th 58 PSI is not strict but 70 Is far too much.
And change the fuel-filer by an ordinary filter with filters directly the fuel coming from the pump before it goes to the injectors.
You can use the same original type of MANN fuel filter for it too but in that case change the fuel direction and block the back-pressure inlet of that Mann filter.
This is also a better solution for your injectors, because in the current situation the fuel is filtered roughly in the pump by a simple strainer.
The fuel is mainly filtered after it is used - Yes a very stupid design - so it can contaminate the injectors ( a strainer is not enough for a sensible injector ) .
Changing the fuel direction at the filter solves this problem.
Most of us have had the same problem and solved it like this I presume.

As mentioned previously if the fuel pump has not been replaced with a Walbro then do so, do that first then if not resolved move on from there one thing at a time or you will never know what the issue was.

It depends a little where you are based.

"Made in the USA by TI Automotive (formerly known as Walbro) "

My "Walbro" did not give enough pressure.
I had to go to TI Automotive - I live in France - to find how to test.
The "Walbro" has a kind of back pressure valve too.
I tested it with air-pressure and so found that it did not give enough pressure anymore.
That was one of the answers of the problems I had. But be aware problems come never alone especially not with a Morgan.

The Morgan still wont stay running.

New fuel pump (Walbro GSS342)- Done
New fuel filter (KL 197) and insulted for galvanic corrosion- Done
New Spark Plugs - Done
Fuel pressure = 59 PSI (after fuel filter replacement)
Fuel injectors cleaned and verified for flow and spray pattern
Fuel tank drained and inspected for debris and varnishing
Air filter is clean.

If the Morgan sits for 20 min or more, it starts right up and idles normally for 2-5 min and then dies. It I feather the throttle I can keep it running but rpms needs to kept above 1600 rpm or it dies. Once it dies it can only be restarted if the throttle is pumped... and the cycle repeats. There are no engine codes.

To my limited experience this continues to present as a fuel starvation issue, but I've no idea what to look at next. O2 sensors? Something in the throttle body?