 Good fuel pump for 914-4 with twin Weber 34 carbs? |
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| detective_snakes |
 Mar 9 2026, 11:07 PM
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#1
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Newbie  Group: Members Posts: 6 Joined: 1-September 24 From: San Fernando Valley Member No.: 28,323 Region Association: Southern California  |
So, since getting my car back "working", I've slowly whittled down the reason for the failing idle as the fuel pump being too strong. I'm pretty sure these carbs are supposed to take 3-4psi, and the mechanic installed a 6psi pump. Great. Amazing, even. Would explain why one of my carbs is backfiring, and the engine won't idle (unless I'm wrong and this is actually an acceptable pump solution?).
Does anyone have a recommendation for a solid pump I can use? At this point I'm past frustrated, just sort of annoyed I put my trust in a mechanic who screwed up constantly. Guess it's true, you want it done, you do it yourself. This isn't a perfect rebuild or anything, so I'm not super interested in shelling big money for Bosch stuff, but if it's what I gotta buy I want to know so I can do things right. And, thanks as always. You guys have helped me more than I could ever ask. If I ever see any of you, beers are on me. |
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| 914werke |
Mar 10 2026, 06:27 AM
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#2
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"I got blisters on me fingers" Group: Members Posts: 11,575 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest 
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Just PU a FP regulator. Id suggest the Holly.
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| mlindner |
Mar 10 2026, 07:10 AM
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#3
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Senior Member Group: Members Posts: 1,743 Joined: 11-November 11 From: Merrimac, WI Member No.: 13,770 Region Association: Upper MidWest
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Pellican, 914 fuel pump, filter, hardware . 3.5 lbs max for carbs at $99. What I have with my 2.2 six with PMOs.....Work great. Mark
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| Superhawk996 |
Mar 10 2026, 07:42 AM
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#4
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914 Guru Group: Members Posts: 7,733 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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QUOTE(detective_snakes @ Mar 10 2026, 01:07 AM)  Would explain why one of my carbs is backfiring, and the engine won't idle Not necessarily. Although high fuel pressure may cause excessive richness it sounds like you’re jumping to a conclusion that a fuel pump is going to solve your problems. What evidence do you have that the carbs are excessively rich? Have the carbs been balanced and synchronized? Are you sure your timing is set properly? Valves adjusted properly? |
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| mmichalik |
Mar 10 2026, 08:30 AM
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#5
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MikeM Group: Members Posts: 792 Joined: 27-January 16 From: Valley Center, CA Member No.: 19,600 Region Association: Southern California
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| brant |
Mar 10 2026, 08:41 AM
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#6
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914 Wizard Group: Members Posts: 12,157 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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most of the pumps for carbs will work.
but adding an adjustable regulator is a rock solid way of getting the pressure correct. and allows you to use the pump you already have. brant |
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| 930cabman |
Mar 10 2026, 09:18 AM
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#7
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Advanced Member Group: Members Posts: 4,526 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
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(IMG:style_emoticons/default/welcome.png)
Yes, fuel pressure regulator is necessary. I have found 2 1/2# is plenty, over pressurizing can be a problem |
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