Point-Seven-five wrote: There may be chemical compatibility issues with Mexican fuels and the systems that run on them.
jjeffries wrote:But among the thoughts that crossed my somewhat askew mind was it a matter of some vendetta by one manufacturer against others. ...What is the concern that the manufacturer singles out Mexican made fuel injection systems?
So after some fun research into j's quote—for which he gives no helpful source and which could possibly have arisen from the spouting off of a random somebody on a random forum like, in fact, I'm doing right now
—the issue seems to arise from chemical incompatibility, a difference in fuel manufacturing components (as .75 suggested) and, perhaps, syntactical problems with written English composition.
The only gasoline widely available in Mexico contains higher percentages of MTBE (rather than ethanol) in its gasoline to provide better octane results at high elevation where its largest consumer bases reside. In fact, it is required in those markets. MTBE has been banned in many USA states because of concern about groundwater pollution from leaking fuel storage tanks. Also, corn-ethanol suppliers have exerted political influence in the adoption of ethanol, and the infrastructure for blending ethanol into gasoline is exponentially more possible in the USA than in Mexico, right now anyway.
Gates 2019 XL hose is not recommended for fuel with concentrations of MTBE approaching those in the Mexican gasoline market. As .75 indicates, Gates 2019 XL hose also isn't suitable for pressures above 50psi that are developed by Brick fuel pumps. Furthermore, vehicle fuel storage at all distribution levels in Mexico seems to have a reputation of sub-USA–standard quality creating further problems with fuel condition and fuel line life.
The phrasing within j's quote is where syntax problems enter. Fuel injection systems
made in Mexico are unlikely to be a problem for the hose that j cited, except if the hoses are submersed in fuel or under high pressure, both of which will cause problems regardless of where the systems are made. Fuel injection systems
used in Mexico that have XL hose could develop problems because they're likely to be delivering gasoline with MTBE concentrations that are not compatible with the long life of XL hose.