Sluggish 73 FI Fastback

lowslowauto · Posted: Sat Apr 19, 2014 6:04 pm Post subject:

Snow melted and got the coil (slightly more narrow than original), and the condenser in, also adjusted the negative terminal to make sure the post and terminal had a good connection. Car will turn over and put and puff to start. By the time I hit it the second time, sounds like a really slow crank!

I'm going w tram...weak battery? (Even though I had it with boosters connected as well) going to check fuel pressure Monday. Followed by oil change and hopefully new battery. Geeeeeez

joey1320 · Posted: Sun Apr 20, 2014 4:38 pm Post subject:

Charge/replace the battery and make sure you have good voltage/amp while cranking.

Also in your previous post, you mentioned really high pressure, if this is still an issue, and while adjusting the fpr nothing happens, check the return line inside fuel tank.

I had a similar issue where my type 3 ran like crap and wouldn't idle worth a sh!t. Turns out the rust inside the fuel tank had clogged the return line orifice, shooting my pressure upwards of 60psi.

See if that's your issue and adjust the pressure after.
Best of luck!
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lowslowauto · Posted: Tue Apr 22, 2014 10:01 am Post subject:

Thanks for the advice Joey!

The pressure spiked because the gauge only went up to 10psi...so not a true indication of a fuel problem. I am going to grab a healthy gauge and test it out hopefully Thursday morning.

I did swap a healthy battery in however it did not change the end result. Tested the voltage (sitting around 13v, and dropped to 11.5v during crank) from the battery.

Fuel is obviously getting back there (smells like fuel, and is getting to the injectors and plugs (wet). Just need to test the pressure.

I still have not changed the oil, or blown out the return...should these be on my MUST do list?

Mike Fisher · Posted: Tue Apr 22, 2014 10:39 am Post subject:

lowslowauto · Posted: Tue Apr 22, 2014 11:04 am Post subject:

lowslowauto · Posted: Wed Apr 23, 2014 7:25 am Post subject:

Went through the Bentley yesterday and found where the return comes off of the pump...other end comes from the regulator? How do I know I'm grabbing the right line?

KTPhil · Posted: Wed Apr 23, 2014 9:03 am Post subject:

EDIT: This is the correct Type 3 diagram:

Image may have been reduced in size. Click image to view fullscreen.

Bobnotch · Posted: Wed Apr 23, 2014 10:09 am Post subject:

KTPhil · Posted: Wed Apr 23, 2014 10:24 am Post subject:

lowslowauto · Posted: Wed Apr 23, 2014 6:49 pm Post subject:

That's definitely helpful gents. When I'm looking at the regulator is there anyway to know the return end there? Hard to see the regulator as it is lol

Mike Fisher · Posted: Wed Apr 23, 2014 7:29 pm Post subject:

The fuel supply comes down the driver side, loops around the engine/injectors & returns to the tank on the passenger side.
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KTPhil · Posted: Thu Apr 24, 2014 9:15 am Post subject:

Pump connections:

Regulator:

Front of car is up and to the right in the regulator photo. Side connection is inlet from 1/2 injector pair; top right connection is return to the fuel tank via the passenger side tunnel pipe.

lowslowauto · Posted: Thu Apr 24, 2014 11:00 am Post subject:

Ok great! Had our daily broken into last night so Ive been dealing with that all day. I did manage to get a water pressure gauge and check the fuel pressure. It sat at 19 the whole time... Obv too low. I adjusted the regulator as per Bentley and tried again. Still 19psi...hrmmmm also noticed the regulator spins as I undo the locknut, is it bolted to the firewall? Now to get under it!

KTPhil · Posted: Thu Apr 24, 2014 3:08 pm Post subject:

There is a nut on the "front" side of the "front" tin, holding the pressure regulator in place. Mine lacked a lock washer so it tends to loosen a bit with age, but this does not affect function, as the hoses pretty much keep it in place.

lowslowauto · Posted: Thu Apr 24, 2014 3:23 pm Post subject:

Makes sense kt! I know I'm beating a dead horse here but will a return line cause low fuel pressure?

KTPhil · Posted: Thu Apr 24, 2014 3:34 pm Post subject:

A return line can only restrict flow, raising pressure in the ring.

With low pressure, it sounds like you need to adjust the fuel pressure regulator (FPR) or replace it.

Low pressure will make it run poorly, and the resultant poor spray pattern will not burn completely, so it will SMELL rich, but RUN lean. Mine did this when it was down to 24 psi after I first put it back on the road.

Tram · Posted: Thu Apr 24, 2014 4:20 pm Post subject:

lowslowauto · Posted: Thu Apr 24, 2014 6:09 pm Post subject:

Went right up to 55-60 with it clamped tram!

lowslowauto · Posted: Thu Apr 24, 2014 6:59 pm Post subject:

Could it be the filter? It hasn't been changed for 3 yrs.

Tram · Posted: Thu Apr 24, 2014 7:38 pm Post subject:


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Sluggish 73 FI Fastback
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