 Fuel Pump Direction, Redline |
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| stoneman30hotmail |
 Sep 17 2023, 02:10 PM
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#1
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Member  Group: Members Posts: 80 Joined: 10-September 22 From: Greensboro, NC Member No.: 26,834 Region Association: South East States  |
Does this pump have a prefered direction? https://www.carburetion.com/products/ProductDetails.aspx...
I can't find directions or indications on it. I'm not getting fuel, but don't know if it's this or the filter or the pressure regulator. It did get stuck when I had it before the filter but then I freed it by reversing polarity. Now I have the filter first. If I reverse polarity now I can hear bubbles in the fuel tank.  |
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| sixnotfour |
Sep 17 2023, 02:52 PM
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#2
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914 Wizard Group: Members Posts: 10,433 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains 
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(IMG:style_emoticons/default/beerchug.gif)
The Large Terminal is Ground, Small Terminal is Positive on this Pump. Attached image(s) 
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| stoneman30hotmail |
Sep 21 2023, 03:32 PM
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#3
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Member Group: Members Posts: 80 Joined: 10-September 22 From: Greensboro, NC Member No.: 26,834 Region Association: South East States |
(IMG:style_emoticons/default/beerchug.gif) I think in the end it was just a bubble in the fuel line. |
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| stoneman30hotmail |
Oct 3 2023, 04:20 AM
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#4
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Member Group: Members Posts: 80 Joined: 10-September 22 From: Greensboro, NC Member No.: 26,834 Region Association: South East States |
Now on finally driving this I got stuck with vapor lock. After sitting a while I could drive off. It's not terribly hot out and this was later in the day. So I'm wondering if the fuel pump is making a lot of heat. In all the playing around above "bubbles" maybe does mean fuel vapor just from the pump heat without the engine running. That may also explain why some cars have problems in the rear location while others don't. Does that fit anyone else's experience?
So now I'm not sure if I should relocate the pump thinking it's going to overheat nomatter where it is. Maybe needs a new pump? |
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| mate914 |
Oct 3 2023, 05:06 AM
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#5
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Matt Group: Members Posts: 751 Joined: 27-February 09 From: Eagles mere, PA Member No.: 10,102 Region Association: North East States
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QUOTE(stoneman30hotmail @ Oct 3 2023, 06:20 AM)  Now on finally driving this I got stuck with vapor lock. After sitting a while I could drive off. It's not terribly hot out and this was later in the day. So I'm wondering if the fuel pump is making a lot of heat. In all the playing around above "bubbles" maybe does mean fuel vapor just from the pump heat without the engine running. That may also explain why some cars have problems in the rear location while others don't. Does that fit anyone else's experience? So now I'm not sure if I should relocate the pump thinking it's going to overheat nomatter where it is. Maybe needs a new pump? Can you show use a picture of your fuel pump installed. I have never seen a fuel pump get hot and vapor lock. I have seen carbed engines that run hot and vapor lock. Things that cause vapor lock. Poor routing of fuel lines, timing, compression too high, engine cooling tins not install, engine covered in 50 year old grim and blocking cooling fins. Hope this helps, Matt |
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| rhodyguy |
Oct 3 2023, 10:51 AM
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#6
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,082 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
Post a picture of the pump mounted. Is hot air blowing on the pump? To what degree has the fuel system been renewed?
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| stoneman30hotmail |
Oct 3 2023, 11:16 AM
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#7
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Member Group: Members Posts: 80 Joined: 10-September 22 From: Greensboro, NC Member No.: 26,834 Region Association: South East States |
It happened again after like a five mile drive. I felt around and nothing is really that hot.
I've been working on the car for a year. So these are the first drives. As part of the redo I've replaced the plastic tunnel lines with metal and all new hoses elsewhere - er may have reused a couple short pieces. New fuel filters.   |
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| rhodyguy |
Oct 3 2023, 11:32 AM
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#8
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,082 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
Is it a dies while driving thing or no restart after sitting while hot? What’s the story with the folded over piping piece near the firewall exit point?
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| stoneman30hotmail |
Oct 3 2023, 12:18 PM
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#9
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Member Group: Members Posts: 80 Joined: 10-September 22 From: Greensboro, NC Member No.: 26,834 Region Association: South East States |
QUOTE(rhodyguy @ Oct 3 2023, 01:32 PM) Is it a dies while driving thing or no restart after sitting while hot? What’s the story with the folded over piping piece near the firewall exit point? Dies while driving. I think by folded over piping piece you mean the return line. But it is connected to the tank. That's just there in case it would be converted over to higher pressure fuel pump I guess. |
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| rhodyguy |
Oct 3 2023, 12:43 PM
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#10
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,082 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
But the line runs from the fold to the filter inlet? The metal line is capped and goes nowhere.
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| mate914 |
Oct 3 2023, 12:46 PM
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#11
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Matt Group: Members Posts: 751 Joined: 27-February 09 From: Eagles mere, PA Member No.: 10,102 Region Association: North East States
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QUOTE(stoneman30hotmail @ Oct 3 2023, 02:18 PM) QUOTE(rhodyguy @ Oct 3 2023, 01:32 PM) Is it a dies while driving thing or no restart after sitting while hot? What’s the story with the folded over piping piece near the firewall exit point? Dies while driving. I think by folded over piping piece you mean the return line. But it is connected to the tank. That's just there in case it would be converted over to higher pressure fuel pump I guess. @stoneman30hotmail Check the fuel tank sock inside the tank for clooging. Fuel pump goes to big fuel line, your connected to the return. Having a fuel return with low pressure is always a good thing because of how the fuel returns to the tank for reserve fuel. I think your running out of gas...... Matt (IMG:style_emoticons/default/flag.gif) |
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| rhodyguy |
Oct 3 2023, 12:52 PM
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#12
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,082 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
The in tank filter sock would be on the factory supply line. I don’t think the sock is currently in play. The folded return (now supply) line could be well fouled with tank debris backed up at the fold. Somewhat of a mess.
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| stoneman30hotmail |
Oct 3 2023, 01:03 PM
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#13
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Member Group: Members Posts: 80 Joined: 10-September 22 From: Greensboro, NC Member No.: 26,834 Region Association: South East States |
QUOTE(rhodyguy @ Oct 3 2023, 02:43 PM) But the line runs from the fold to the filter inlet? The metal line is capped and goes nowhere. Right, it's these https://www.pelicanparts.com/cgi-bin/smart/...=PEL-SS914-7074 Are you saying both are needed for some reason? Not sure where I'd put it off the carburator. Or I connected the wrong one to the pump? I got a couple fuel baths rearranging things to begin with. There is fuel comming out the smaller diameter one after putting 1 gal in the tank. So I'm pretty sure I got the feed line going to the filter. |
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| mate914 |
Oct 3 2023, 01:06 PM
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#14
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Matt Group: Members Posts: 751 Joined: 27-February 09 From: Eagles mere, PA Member No.: 10,102 Region Association: North East States
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QUOTE(stoneman30hotmail @ Oct 3 2023, 03:03 PM) QUOTE(rhodyguy @ Oct 3 2023, 02:43 PM) But the line runs from the fold to the filter inlet? The metal line is capped and goes nowhere. Right, it's these https://www.pelicanparts.com/cgi-bin/smart/...=PEL-SS914-7074 Are you saying both are needed for some reason? Not sure where I'd put it off the carburator. Or I connected the wrong one to the pump? I got a couple fuel baths rearranging things to begin with. There is fuel comming out the smaller diameter one after putting 1 gal in the tank. So I'm pretty sure I got the feed line going to the filter. Might want to double check that. Large line coming out of tank is the feed. Small is the return. Matt |
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| rhodyguy |
Oct 3 2023, 01:16 PM
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#15
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,082 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
The hardline link is for a set. Only one is on your car.
Is it carbs (with an s) or carb as in a single? Long story short, the fuel pump supply line is connected to the folded over and now kinked return line. |
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| stoneman30hotmail |
Oct 3 2023, 02:01 PM
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#16
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Member Group: Members Posts: 80 Joined: 10-September 22 From: Greensboro, NC Member No.: 26,834 Region Association: South East States |
Ok, good tip, larger line is feed. (IMG:style_emoticons/default/wacko.gif) Then I need some kind of reducer thing to get to the filter unless I get that in the filter..
Another clue: If I blow into the line from the carb, the pump works for a while. That allowed me to take the first drive and then I did it again got another 4 miles and now again and I got 1/2 mile home. At first I didn't think that was the temporary fix, but maybe was. Maybe I need another fuel filter already also? |
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| stoneman30hotmail |
Oct 4 2023, 05:48 PM
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#17
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Member Group: Members Posts: 80 Joined: 10-September 22 From: Greensboro, NC Member No.: 26,834 Region Association: South East States |
Heres a better picture of the bends. They're as they came.
 Now with the right line as supply.  But it still doesn't work. A few tests run: 1. Disconnect large pipe - lots of fuel drop out. I probably let out 1/2 gallon in 15 seconds. So not the sock. 2. Disconnect line at carburator, run pump (key on) - pumps continuous (1/2 gallon fast) . So not a clog. 3. Idle engine - starts at 2 psi at gauge, stalls after 5-10 min, no pressure at fuel gauge, pump still buzzing (after draining some fuel through system) 4. Leave pump to run, engine off, no flow - fuel pressure gauge shows 2 psi after regulator but pressure drop to 0 eventually (5-10min) pump still buzzing |
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| ChrisFoley |
Oct 4 2023, 06:17 PM
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#18
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I am Tangerine Racing Group: Members Posts: 7,933 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None
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bad pump
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| stoneman30hotmail |
Oct 5 2023, 04:37 AM
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#19
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Member Group: Members Posts: 80 Joined: 10-September 22 From: Greensboro, NC Member No.: 26,834 Region Association: South East States |
Any recommendations? I saw summit racing has a $40 option. But I have Napa, Autozone, Orielly and Advance Autox2 within 5 miles.
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| mate914 |
Oct 5 2023, 04:58 AM
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#20
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Matt Group: Members Posts: 751 Joined: 27-February 09 From: Eagles mere, PA Member No.: 10,102 Region Association: North East States
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QUOTE(stoneman30hotmail @ Oct 5 2023, 06:37 AM) Any recommendations? I saw summit racing has a $40 option. But I have Napa, Autozone, Orielly and Advance Autox2 within 5 miles. LN Engineering has the best price and shipping was fast. $52.49 Matt |
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