Just installed my Glowshift fuel pressure gauge, and everything is ok at idle. When the truck is at idle it reads right around 15 psi. My problem is that when driving down the road it spikes from 10 to 20, it will stay constant at about 15 psi for a few miles then it will drop to around 10 and quickly spike to 20 then drop back down to around 15. I have the snubber valve installed as per the instructions, the only thing i did different was install the sending unit at the injection pump instead of the at the lift pump. Anyone have any ideas as to what might be the problem???
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