Terrible advice, for two main reasons.
1. The fuel pump connector is a automotive standard connection that has corrosion resistance and is made weatherproof.
2. Direct connections can work great initially but deteriorate over time, prone to physical damage and are known to cause shorts or fire hazard.
I can only suggest you replace the wiring including a new connector, at the very least clean the connector using an alcohol-pad / spirit swab, from the pharmacy and check for broken/corroded terminals. If everything looks shiny then its not the connector and most definitely does not need any modification. Secondly, if you have physically touched a high-amp drawing dc connection like the fuel-pump you have to make sure you donot leave any residue on direct contacts, even your skin oils are highly corrosive to copper and EN plated terminals.