fuel pump ?
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Teching In
Joined: Dec 2012
Posts: 13
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fuel pump ? so I was thinking my 94 z was having an opti issue, well after sitting at the shop for a few weeks I have realized that im having a fuel supply-volume issue, it seams ad the car isn't getting enough, I tested the fpr and the psi went up about 10 or so at idle, but when I rev the car it drops down to 30-35 psi any thoughts, I have a 2 week old airtech pump in it, would swaping to a racetronix set up be a good idea?
Your post is slightly confusing.
What is the fuel pressure with the key on, engine off?
What is the fuel pressure with the engine running?
What is the fuel pressure with the engine running and the FPR vacuum line disconnected?
What is the fuel pressure under part throttle and WOT?
Does the fuel pressure drop off quickly after the pump stops?
Answer as many of those questions as you can and we'll go from there.
What is the fuel pressure with the key on, engine off?
What is the fuel pressure with the engine running?
What is the fuel pressure with the engine running and the FPR vacuum line disconnected?
What is the fuel pressure under part throttle and WOT?
Does the fuel pressure drop off quickly after the pump stops?
Answer as many of those questions as you can and we'll go from there.
Fuel pressure is kept at a constant when compared to manifold vacuum. So high vacuum situations like coasting or idle result in low pressure when read by a regular gauge. If your intake tract is choked up that will lead to vacuum and slightly low fuel pressure reading at WOT.
Looking around at that pump it looks like generic parts store stuff at Walbro pricing. Did you use the stock clear fuel tube or was it supplied with a piece of black hose and clamps?
Your fuel pressure looks maybe a little low but hell a cheap gauge or something could cause that.
When was the last filter change?
Looking around at that pump it looks like generic parts store stuff at Walbro pricing. Did you use the stock clear fuel tube or was it supplied with a piece of black hose and clamps?
Your fuel pressure looks maybe a little low but hell a cheap gauge or something could cause that.
When was the last filter change?
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On The Tree
Joined: Dec 2011
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From: Kissimmee, Florida