I have 1/4 inch line from top of fuel filter and banjo bolt on ip. The gauge from ff reads 10psi the gauge from 1p reads 15 psi. These are mech. gauges is 1/4 line to big for an accurate reading ? THANKS ED

I think the line shouldn't matter. Pressure will be the same no matter how big it is. What's odd is the 5psi drop between filter and vp. Clogged filter? 10 psi isn't near enough for the vp to stay healthy.

It has 15psi at ip & 10 at filter.

It has 15psi at ip & 10 at filter.

So it has less at the filter than IP? Are you running more than one pump?

I use 1/8" air brake line which happens to be rated for burst strength of about 600-800 PSI. So 1/4" line is over kill.14-20 PSI is normal range for fuel pressure.5 PSI drop is a sign of plugged filter from one port to the other.

I only have a ad 100 with big line from supply line to filter. I took supply line loose between filter and ip then ran pump each cycle it would pump 52-54oz. Could be a bad gauge(1 month old) sw is probably made in china now. THANKS ED:spend:

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I did not think the 01's had a tap on top of the filter. I thought they were like my 02 with the screw on cap and drop in filter. Early 01's maybe not?

You are correct. Mine is an early 01 and it has the drop in style filter. I'm confused as to where he is getting his reading there.

Some models I've seen where there is a test port at the inlet of the filter housing and then the second port on the inlet of the VP44.

I got the tapped ff top from genos. Will try another gauge tomorrow. THANKS ED:spend:

That would explain it.

I've seen where people have posted the earlier canisters like I've got are a major restriction but I don't see anymore of a pressure drop than the next guy. I love the steel canister with all the ports in the top. I use one for fuel pressure gauge, one for my low pressure idiot light I have to attract my attention in case my pressure goes to hell and I don't notice it right away (big red light illuminates in dash), and the last port I have a small needle valve with a short piece of tubing bent in a 90* elbow with a chunk of clear plastic hose stuffed over the end and ran down to the axle. That way when I have to break into the fuel system for any reason, I can bump the starter to engage the lift pump and barely crack the valve and watch the air bubbles come out in the fuel. I may have to repeat this a few times but eventually it will push solid fuel out and being its the highest point in the fuel system I can successfully bleed all the air out of the system without having to crank the engine over and bleed it through the injectors.

Stewart warner fuel pressure gauge went bad after two months. Replaced with ashcroft pro. made by smith instruments which is glycerin filled. SS copper movement cost 14.99 on amazon. Needle valve not required. Comes up slowly holds steady also it is adjustable.