Regular heat shrink isn't designed for being submerged in fuel, RW-200-E heat shrink is and is what you need to protect your wiring if swapping to an aftermarket fuel pump.
RW-200-E Heat Shrink in 2" sections. Flame-retardant polyolefin heat shrink tubing. Resistant to many fuels, lubricants, solvents, and acids.
10 available, £1.99 each plus 75p postage (postage is a flat rate per order regardless of how many you order).
Sold in individual 2" sections. Size is 3.2mm, shrinks to ~1.5mm which is fine for the OE fuel pump wiring.
RW-200-E Heat Shrink in 2" sections. Flame-retardant polyolefin heat shrink tubing. Resistant to many fuels, lubricants, solvents, and acids.
10 available, £1.99 each plus 75p postage (postage is a flat rate per order regardless of how many you order).
Sold in individual 2" sections. Size is 3.2mm, shrinks to ~1.5mm which is fine for the OE fuel pump wiring.
