03-06-2018, 05:59 AM
As Clint says, probably sucking air.
But, and forgive me, for I am not an additive fan. There can be a situation where additives can cause what appears to be bubbles in the fuel. Some additives contain methanol, which is a solvent which will dissolve in water and in diesel fuel. However, only to a small percentage before it saturates, and starts to coalescence into tiny droplets suspended in the fuel. This is probably not your case, but why I asked what happens when the fuel flow stops. Do the bubbles rise to the top, as air should? or do they stay suspended in the fuel as methanol would?
But, and forgive me, for I am not an additive fan. There can be a situation where additives can cause what appears to be bubbles in the fuel. Some additives contain methanol, which is a solvent which will dissolve in water and in diesel fuel. However, only to a small percentage before it saturates, and starts to coalescence into tiny droplets suspended in the fuel. This is probably not your case, but why I asked what happens when the fuel flow stops. Do the bubbles rise to the top, as air should? or do they stay suspended in the fuel as methanol would?
Richard and Rhonda Entrekin
99 Newell, 512
Maverick Hybrid Toad
Inverness, FL (when we're home
)