Fuel Flow Problem

[luvndasun]

Hi -
I have a 2.2L engine w/webers and electric fuel pump. When I try to start the car, it will only run if I pour gas down the carb barrels. I pulled the fuel line off of the fuel filter and turned the key. The fuel pump is whirring away, but there is no gas coming out of the fuel line. I then took the fuel line off of the fuel pump inlet and no gas was present. Any suggestions?
Thanks

[Early_S_Man]

Rust clogged fuel line in tunnel ... or clogged fine bronze screen prefilter under gland nut for tank outlet in tank ...

You can do a cursory check for rusted contents of tank by pulling out the fuel tank sender ... examine very, VERY carefully with Mini-Mag flashlight, please!

[luvndasun]

I had the tank out, cleaned it, and did the POR Tank treatment. How would I find out if I had rust in the fuel line and how could I fix it? Could I blow it out with air?
What would the symptons be if I had the two lines coming out of the tank crossed?

[Huh]

you could blow out the lines. Does it also have a fuel filter? I had problems on my old Unimog that would only start then die then a few minutes later start again. I blew out the lines then found out the fuel filter got extremely clogged with rust.

[luvndasun]

I have a fuel filter that is after the fuel pump and before the carbs. I dont think that there is another filter between the tank and the pump. So my problem seems to be between the tank and the pump.

[Early_S_Man]

Crossed lines are not likely, since the tank outlet is 9 mm and return line is 7 mm.

Did you remove the gland nut, outlet tube, and fine bronze screen before you did the POR treatment???

Blowing out rusted line through the tunnel would only be a palliative, temporary measure ... if rust-clogged, the line MUST be replaced for trouble-free carb operation! Unless you happen to like going through this mess on a yearly basis!

[luvndasun]

Yep removed all of the tank harware before I did the POR treatment. I'll try pulling the lines off of the tank tonight to see if the fuel is exiting the tank. If it is, I guess I will replace the fuel lines...uggggh! Thanks!

[bbaer6676]

what fuel pump are you using? the bosch with the 3 lines?

brian

[Huh]

Luvndasun....what I am saying is that the fuel filter could be very clogged. I ended up replacing my fuel lines but if the filter is clogged you won't get squat to your carb. I would look there first. Try placing a clear filter on to see how the gas is looking after your POR treatment. See if the sediment falls to the bottom of the filter.

[luvndasun]

The fuel pump is actually a Holley, and only has two lines inlet and outlet. It was in the car when I got it.
Huh - You are right, I should go ahead and replace the fuel filter while I am at it since it may be full of rust also. I was actually also thinking of putting the glas filter in. Having one would sure cut down on diagnostic time, since I could see if it has fuel and if its dirty.

[Grady Clay]

Luvndasun,

Step back and take a deep breath. It probably isn’t all that
bad. With some patients and “help from your (Pelican)
friends,” this will turn out for the best.

First, gasoline is probably one of the more dangerous
substances we normally come in contact with. Be careful!

This is not permitted.



It is probably easiest to take the 9 mm hose off at the fuel
pump. With the back of the 911 up it may not drain fuel.
Plug the hose and snake it out of the retaining brackets
on the chassis. Once you have the hose hanging down
you can let it drain into a container. Measure the flow rate.
I will speculate that it should be 100-300 ml/min. The
problem with this test is it depends on too many factors;
most important is how full the tank is. In any event it
should let you drain the gas tank If no fuel flows, repeat
the effort at the tank. If still unsuccessful, siphon the fuel
out via the fuel level sender opening.

Once the tank is empty, remove the front pan and remove
the screen filter fitting from the tank. It may be that
something from the sealing process clogged the screen.
It is also possible that the screen wasn’t sufficiently
cleaned. This fine screen can be totally clogged yet still
show the screen wire pattern. Carb cleaner and a brush
are necessary.

You also want to make sure the return is free of any
obstruction. Blow some compressed air through every
hose/pipe to confirm they are free of obstruction.

Hang in there.

Best,
Grady

[bbaer6676]

i would take the line off at the fuel filter in the engine compartment, place it in a bucket, turn the key, prime the fuel pump and see if fuel flows out. then work your way back, you do hear your pump correct, just making sure its working.?

[luvndasun]

Looks like bbaer6676 is the winner. Last night I ck'd again for fuel at the pump inlet and there was nothing. I pulled the lines from the tank to ck for debris and it was clean. Then I blew out the fuel lines with pressurised air and the lines were clear. The last thing I did was put some gas in a small container, hooked a hose to the fuel pump, dropped it in the gas, turned the key to see if the pump would suck up the fuel. The pump whirrred and wined but did not suck. Looks like the fuel pump has failed.
A bonus from this mess was that I did a search last night on weber and recirculation. I found out what the extra hose in my engine compartment was. It was the fuel return line to the tank. I guess with webers and an electric fuel pump, you dont need the return line. Although, it sounds like from the threads that i read that a return line is a really good thing to have to help to reduce the fuel pressure fluctuations and keep the fuel cool . Maybe a future project.
It was a nasty smelly job, but at least I feel like I am making progress.
I still have ten fingers, ten toes, and two eye brows....no kaabooom!
Thanks for the help!

[luvndasun]

One last question -
What fuel pump would people recommend? Pelican has two that look they will work with my set up.
Hardi Fuel Pump
Rotary Fuel Pump and Regulator (PEL-WP99009-131, WP-31800-063)
Thanks again!

[bbaer6676]

I use a bosch so im not really sure, let me check when i get home, if it spins it might be rebuildable. ill let you know.

brian

[jstobo]

If you have a 72, the reason you have a return line is that originally you had fuel injection. Either MFI or CIS if its a T. Both use a return line. Unless you have a high pressure pump and need to regulate it down for the webers, you do not need the return line. Think of it as a spare.

[bbaer6676]

doesnt the bosch pump also have a return line, i use this pump on zenith carbs.