Would a chin liposuction alone (no implant) make my weak chin and jaw look better? (Photo)

You do not need to have a chin implant to have improvement in your neck.  If you would like to take things simple and have improvement without major lift procedure and proper chin micro lipo by very experienced surgeon would give you enough improvement.   It is all matter of what you want not what a surgeon wants.  

A combination of treatments may be needed to get the results you want. Neck liposuction is a great option for patients with good skin elasticity and excess fat in the neck and around the jawline. Liposuction is effective at removing this excess fat and stimulating the skin to contract over time to create improved angulation and definition along the jawline. You may decide a chin implant would help provide more projection. I recommend seeing an expert for a consultation. I hope this helps!

Thank you for your question and posting appropriate pictures. You seem to be a good candidate for laser liposuction (SmartLipo) of your neck and fat grafting to your chin  as you need minimal value added to your chin without a need for a chin implant. You would need a consult for precise recommendations. 

Chin liposuction is a simple, single step procedure which can have tremendous benefits on your appearance.  You appear to be an excellent candidate.

Hello
Thanks for the question and provided information as well. 
Based on your photo you are a good candidate for chin liposuction, Chin liposuction may be an option, it makes you look younger and more attractive with a sharp jawline , and better facial proportions.
I recommend you to make an appointment with a board certified plastic surgeon for a good evaluation and to talk about your goals.
Good luck :)

 Simple liposuction alone will only accomplish removing  the fatty deposits above the  platysma muscle, and will be an incomplete result. A neck lift procedure can accomplish removal of both deposits of fat ( Above and below the platysma muscle) and release the anterior restraining mandibular ligament which is causing the crease right below the chin. Adding an implant to the chin will give a better foundation/ structure/ support for the soft tissues in the neck when there's weak and recessive chin profile.