Would this fix work?

[BDR]

The pulsations from the VP are driving me nuts. If I tapped in further away from the pump would that eliminate the pulsations? With an inline tap? This is where I have it now. Too close? Any help would be greatly appreciated. Thanks



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[dresslered]

BDR-

That is a nice looking installation, but you are correct that you are not installed in the ideal location. It would also be helpful to describe the rest of your set-up (i. e. electric/mechanical pressure gauge, snubber, isolator, etc. ). I would suggest that you move your pressure line to the bottom of the fuel filter. I use Ray's tapped banjo bolt for this. This location is still the outlet of the fuel filter so you are measuring the proper pressure of the VP44 but you have distanced yourself from it. Did you leave the stock rubber hose between the fuel filter and VP44? This hose, because it is flexible, offers some dampening of the water hammer effect that you are seeing on the guage. Addtionally, you will want a snubber inline or a rubber hose to your sender (I use a grease gun hose). The steel braided hoses are nice, but there is no flex to them so the pulsations are still passed through to your sender (also be aware that these pulses are very hard on the electric senders). If you want to stay with your braided lines, make sure that you install an inline snubber of some kind. I have seen them on this site and basically are a mechanical device that have a very small pin hole to pass the pressure changes. Your valve might actually work in itself if you tighten it to the nearly closed position. Good luck,

David

 

[pgleavitt]

Move it back close to the fuel filter and use the needle valve in an almost closed position and you can eliminate the pulses. I had the same problem and thats what worked for me.

 

[jdooner]

BDR

My gauge bounces around a lot also, even with the snubber just barely cracked. To preserve the sending unit, I think I'll close the valve completely and just check fuel pressure periodically.

Dooner

98. 5 QC, LWB. Emeral Green. . Mildly modified

 

[dresslered]

jdooner-

I would not recommend the occassional check. I've had two lift pumps with intermittants. Each would go from full pressure to 1-3psi at idle for several miles. I had to baby the throttle to keep it from dropping to zero. After a few minutes, everything would return back to normal. This symptom would occur just once a week at first, but then krept up to a daily occurance. It is just like a vane would occassionally stick or something. Each time the problem was rectified by replacing the pump. I would want to contunuously monitor the fuel pressure.

 

[BDR]

Thanks for the replies and help. Well here's the thing, I'm runnin an AirDog. So I'm not using the original system, lift pump, filter canister, banjos. So mounting it near the filter wouldn't work. I'm running an Isspro mechanical FP gauge, 30psi. SS braided line, I know it's overkill. And a needle valve, which you can see in the picture. No isolator. My gauge reads perfect, doesn't bounce, and the needle is smooth. I can just hear the pulsations through my system. Drives me crazy when the rpms change. I was thinking one of these further back from the VP. Ideas, thoughts, suggestions?



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[dresslered]

I think that I understand you now and I doubt that I can offer in real advice. Since the needle is stable, it sounds like a mechanical resonance. Perhaps your idea may help or adding an isolator would control the noise. Though it is not as cool ( ) as the SS braided line, it's amazing what a short piece of rubber tubing can do to dampen vibrations. You could always turn up the radio a bit.

 

[BDR]

Thanks for the help dresslered. I do that anyway Anyone else, ideas, suggestions?