• Wishlists
  • 877-477-7823
  • Contact Us


Add to Wishlist
Part# 05-21300
MFR Model# 73104


Since the introduction of 100LL as the main fuel for low-compression engines, Alcor has been a leader in providing pilots a fuel treatment that eliminates lead before it can cause fouling.
TCP is the only FAA approved product of its kind.

For use in Non-Turbocharged Continental, Lycoming and Franklin Aviation Engines.

A simple one-shot treatment with every fill-up prevents lead build-up on spark plugs and valves.

Rely on the one-and-only Alcor TCP Fuel Treatment for a cleaner and smoother-running engine!
Available in Ready to use Single Quart containers.

Required TCP Applicator/Syringe sold separately:

TCP Fuel Treatment Applicator/Syringe: Calibrated for proper dosage of the number of gallons treated for 100LL grade avgas (required for use on the Quart bottles).


The Lycoming O235 in my C152 is very prone to spark plug fouling from the lead in 100LL. TCP fuel treatment has completely eliminated that problem. The engine runs better too. My A&P notices the difference during my annual inspection.

Richard S
December 11, 2019

Using this product makes Spark plug fouling and sticking valves a thing of the past !!! And....Spruce sells it at an unbeatable price. (I saw this product sell for 74$ )

Raymond R
November 21, 2019

I donât usually bother to ârateâ products but as an A&PIA and pilot/CFI thatâs been a professional in the aviation community for a bit over 50 years I have had numerous small Continental owners limp in with sticking valves as a result of TEL (tetraethylead) fouling. TCP is the one, faa âapprovedâ solution. It will NOT remove existing deposits and itâs a bit pricy but it DOES prevent the problem. Without is all A, and C series and particularly C-145/O300 will lead foul on 100 L L. Even a mix of autogas and 100 eventually end with sticking valves (and plugs).

Terk W
October 18, 2019

Good stuff. Never a problem with fouled plugs on my O-320!

July 29, 2019

My Cherokee 180 was having issues with fouling and valve deposits. After using TCP in two successive tanks my O-360 is running perfectly smooth and plugs are clean with no lead deposits. I now use TCP in every or every other tank fill up.

July 16, 2019

My engine seems to have better power and starts up first blade spin since Ive been treating the fuel. although i run fine wire plugs i get 0 lead fouling now very happy.

Doug S
April 21, 2019

Definitely makes a difference in the performance of my 64 C150D.

Philip W
December 6, 2018

a fair price and quick delivery

John T
October 11, 2018

A Top Shelf product and highly recommend.

October 6, 2018

I have been using TCP for a couple of years now in my C-182 (bladder tanks) and have found it to be very effective in reducing lead fouling on the plugs and lead deposits in general. The stuff needs to be handled carefully. (Package says not to get it on your paint.) Hauling it around and injecting it at every fill is inconvenient. I bought a sealed plastic container to keep it in ($10 from Amazon search on: LOCK & LOCK Airtight Square Tall Food Storage Container 135.25-oz / 16.91-cup) and that gives me peace of mind when Im carrying it in the baggage area (which is all the time). Sure, I wish it was cheaper... but I think the advantages outweigh the cost or I wouldnt keep buying it. I found the shipping charges to be reasonable. I usually get at least 2 cans per order.

September 28, 2018


Q: Can you ship this product to Hawaii?

Per the warehouse manager: Yes, this can be shipped UPS 2-Day or Fedex Priority to Hawaii.

Q: Does Alcor TCP Fuel Treatment incur a hazardous charge for shipping?

If it ships via ground transportation within the USA, there is no hazardous fee.

Q: How many gallons does one quart of Alcor TCP treat?

Per Supplier: One quart will treat about 320 gallons.

Q: Can using TCP fuel treatment cause CHTs to rise?

No, TCP use does not impact the power provided by leaded fuel and will not change the octane because of the low concentration. Only acts as a lead scavenger preventing lead fouling.

Q: Does TCP have an expiration date and if so how long after manufacture?

TCP will last several years providing the can is kept sealed and that the can is stored under conditions that minimize rust.

Q: Is this Alcor TCP fuel treatment product safe to use with a bladder tank?

Per the vendor, it is safe for bladder style tanks.

Q: Is this TCP a preventive product or will it reduce, eliminate lead deposits that have already formed on components within the cylinder?

It will prevent deposits but will not clean whats already there.

View in Catalog

View Image View in Catalog