My pump has 78K miles on it and it is going strong. For 70K miles it has not had to sip fuel through a fine straw. I have 3/8" id. SAE 30R7 fuel hose running from a reamed fuel pickup to the 2 micron Dahl filter and 3/8" hose running from the Dahl filter to the pump. None of the lines have a sharp or tight radius bend. The restriction from this system is VERY low, on the order of a several inches of water. The pump can meet the demand of my EHed nozzle DDP AC single shot injectors at WOT with less than 2 psi drop in fuel pressure. If you opened up the supply side to the fuel pump it would probably have less trouble keeping up with demand.
I can record the maximum fuel pressure seen by my SPA technique gauges and have seen spikes as high as 90 psi. No problems in the past 20+K miles with this behavior. My pump holds 70-72 psi. without issue. I am not sure I would worry about a transient spike in pressure. I agree with the comment about changing the filter. Any restriction can impede the output of the pump to the injectors.
I can record the maximum fuel pressure seen by my SPA technique gauges and have seen spikes as high as 90 psi. No problems in the past 20+K miles with this behavior. My pump holds 70-72 psi. without issue. I am not sure I would worry about a transient spike in pressure. I agree with the comment about changing the filter. Any restriction can impede the output of the pump to the injectors.
