New Guy here....First post...Great Site and glad to be here.

I'm reviving a '67 "project" and recently got the engine running again. I have one of those in-line glass fuel filters (I know the down-falls of the filter but I'm keeping it.) Any-way, the filter fills up nicely when I start the engine but if I let the engine sit for several days (without running) the fuel in the filter/fuel line drains out.

Since I've never used an in-line glass fuel filter before (even during my old hotrod days) I don't know if this is normal or if this indicates a problem with my fuel pump allowing fuel to drain back down the line. Thanks.

Welcome. Had one of those on my 1st car, '70 Mustang fastback with a 351 Cleveland 4 barrel, for years. My experience is that this is normal. The other thing you will notice is that the glass filter is never full, even when it is running.

However, strongly recommend you replace it with the kinda see-through plastic filter.

Also, since you are from Houston, strongly suggest you contact Bjorn, site admin, and join HALF, the very active local Houston FGF group.

thx for the plug!

yes Brett, You May do that! lol....
wherabouts in Houston are you? we have a nice group of first genners! and of course we are all over the place...I`m out west side, Gessner /Memorial area, but folks are in Woodlands ,Huntsville,Sugarland, Katy, the Heights, Magnolia,Kingwood, ( out of town , long distance members in Corpus, Austin ,San Antonio,Seattle , Norway) etc,etc..,..and of course many around central /SW area of town
you can get hold of me at
bsefeldt@mhinc.com

Thanks for the warm welcome and answer to my question. I feel more confident about my fuel pump now.

I sent Bjorn a PM. Thanks for the lead.

Your issue is most likely a combination of issues:

I am not an expert about fuel pumps, but I am sure there is some leakage back down the fuel line to the fuel pump due to gravity after the pressure in the fuel lines from the pump disipates.

The other is a bit better established from a "science" perspective. The vapor pressure of today's fuels is a far cry from what it was when these cars were built. So our carbs "dry out" if they are not started for a couple of days because they fuel systems are "open" to the atmosphere.

Today's fuel injections systems are "closed" so 1) fuel pressure does not bleed off very fast at all, and 2) there is little evaporation allowed anymore as that's bad for air quaility. In addition, when you turn the key to "run" before you turn it to "start" you may notice that the fuel pump energizes the system even before the motor starts turning over.

Thus the reason why you have probably to crank your FGF over a bunch before it fires here in the "modern age". Unless you have an electric fuel pump.

When I started on this project fuel was not getting to the carburetor. So I thought the fuel pump was bad. I took off the fuel pump, but when I pressed on the actuator arm, fuel shot out from the pump. So I put the fuel pump back on and it started right up. I can't explain that one.

So when the fuel drained out of the filter, I was worried that I would need to remove the pump again. But even when the filter had no fuel in it, the engine fired right up without a lot of "cranking". So I know the pump is pumping real good. I was curious about the "draining" of the fuel filter when I leave it sitting for 3 days or more.

I never used a "see through" filter before, so I didn't know if the fuel draining was normal or not. Things are working good the way they are so I won't change anything. For now I'll assume the draining is normal and move on to the next step of reviving this "tired ol' girl".

Thanks again for the help.