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Post by drphilip on Aug 26, 2023 7:51:32 GMT -5
I finally installed my freshly tuned carburetor (Thanks Scoutpilot!!!) yesterday. I have a 1/4" hard fuel line from the tank to the frame rail. Fuel filter inline then a new Carter M2195 (Made in USA NOS) Fuel Pump. 1/4 hard line to a carter gf 827 ceramic fuel filter just before the carb. Everything from the tank to the carb is new. I started the jeep and it ran terribly, hunting like mad. I put a pressure gauge on the fuel line at the carburetor and got a reading of 4.2 PSI - way too much. QUESTION 1: Is the correct thing to do here to install a thicker gasket to space the fuel pump out from the block and drop the pressure? QUESTION 2: What sealant between the fuel pump and gasket, gasket and engine block? (I used permatex on both sides, but this of course means a trashed gasket for any repair.) While it was sputtering, I checked the vacuum: I have two vacuum connections: Vacuum advance from the distributor connects to the throttle body. PCV valve to manifold below the carburetor. Vacuum lines are rigid. PCV valve was cleaned out and seems to work on the bench. First I checked it at the vacuum at the T where the PCV exits and turns across the front of the engine. This have me 5 in vacuum. Next, I disconnected the PCV line at the manifold and hooked the vacuum gauge directly into this port. Here I got 15 in vacuum. QUESTION 3: Does this indicate I need a PCV valve? Thanks!! Pictures below.
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Post by Scoutpilot on Aug 26, 2023 11:11:14 GMT -5
I finally installed my freshly tuned carburetor (Thanks Scoutpilot!!!) yesterday. You're welcome.I have a 1/4" hard fuel line from the tank to the frame rail. Fuel filter inline then a new Carter M2195 (Made in USA NOS) Fuel Pump. 1/4 hard line to a carter gf 827 ceramic fuel filter just before the carb. Everything from the tank to the carb is new. Two things here. I typically run 5/16" steel with inverted flares and fittings. Standard issue for the F head 134 was an AC 9562 dual action pump. The vacuum end connects to the PCV tube on the driver's side at the 'T' fitting you have but have blocked.I started the jeep and it ran terribly, hunting like mad. I put a pressure gauge on the fuel line at the carburetor and got a reading of 4.2 PSI - way too much. Indeed!QUESTION 1: Is the correct thing to do here to install a thicker gasket to space the fuel pump out from the block and drop the pressure? If you wish to continue using this pump then a thin spacer with a gasket on both sides will lower that pressure.QUESTION 2: What sealant between the fuel pump and gasket, gasket and engine block? (I used permatex on both sides, but this of course means a trashed gasket for any repair.) I recommend Permatex Indian Head Shellac. While it was sputtering, I checked the vacuum: I have two vacuum connections: Vacuum advance from the distributor connects to the throttle body. PCV valve to manifold below the carburetor. Vacuum lines are rigid. PCV valve was cleaned out and seems to work on the bench. To get a proper vacuum reading you want post throttle plate vacuum. The vacuum advance port on the throttle will give pre-plate vacuum. During testing and adjustment (tune-up) this line should be disconnected and capped and plugged.First I checked it at the vacuum at the T where the PCV exits and turns across the front of the engine. This have me 5 in vacuum. Were all other vacuum ports/lines capped and sealed? Typically, this is where you would take you vacuum readings.Next, I disconnected the PCV line at the manifold and hooked the vacuum gauge directly into this port. Here I got 15 in vacuum. See above.QUESTION 3: Does this indicate I need a PCV valve? Have you checked to determine if it can be disassembled and cleaned?Thanks!! Pictures below.
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Post by drphilip on Aug 28, 2023 7:00:22 GMT -5
I finally installed my freshly tuned carburetor (Thanks Scoutpilot!!!) yesterday. You're welcome.I have a 1/4" hard fuel line from the tank to the frame rail. Fuel filter inline then a new Carter M2195 (Made in USA NOS) Fuel Pump. 1/4 hard line to a carter gf 827 ceramic fuel filter just before the carb. Everything from the tank to the carb is new. Two things here. I typically run 5/16" steel with inverted flares and fittings. Standard issue for the F head 134 was an AC 9562 dual action pump. The vacuum end connects to the PCV tube on the driver's side at the 'T' fitting you have but have blocked.After I get it sorted and running, I will resize the lines. That's easy work :-)
Is the single stage pump ok to use? This jeep has electric wipers on it. Should I put in a 9562 and hook up the vacuum? If so, can you PM me if you have one?
I started the jeep and it ran terribly, hunting like mad. I put a pressure gauge on the fuel line at the carburetor and got a reading of 4.2 PSI - way too much. Indeed!QUESTION 1: Is the correct thing to do here to install a thicker gasket to space the fuel pump out from the block and drop the pressure? If you wish to continue using this pump then a thin spacer with a gasket on both sides will lower that pressure.From other posts from you, it looks like the spacer should be about 1/8 thick. Is that correct?
QUESTION 2: What sealant between the fuel pump and gasket, gasket and engine block? (I used permatex on both sides, but this of course means a trashed gasket for any repair.) I recommend Permatex Indian Head Shellac. While it was sputtering, I checked the vacuum: I have two vacuum connections: Vacuum advance from the distributor connects to the throttle body. PCV valve to manifold below the carburetor. Vacuum lines are rigid. PCV valve was cleaned out and seems to work on the bench. To get a proper vacuum reading you want post throttle plate vacuum. The vacuum advance port on the throttle will give pre-plate vacuum. During testing and adjustment (tune-up) this line should be disconnected and capped and plugged.Will do.First I checked it at the vacuum at the T where the PCV exits and turns across the front of the engine. This have me 5 in vacuum. Were all other vacuum ports/lines capped and sealed? Typically, this is where you would take you vacuum readings.I did not have the vacuum advance port plugged. Will retest after I space the fuel pump to lower the pressure.
Next, I disconnected the PCV line at the manifold and hooked the vacuum gauge directly into this port. Here I got 15 in vacuum. See above.
Just for clarity, this was not the port on the throttle body, it was the port in the head.QUESTION 3: Does this indicate I need a PCV valve? Have you checked to determine if it can be disassembled and cleaned?
It was disassembled and cleaned. The spring did not seem to be holding the check valve tightly, it was a looser fit and the check valve rattled a bit if shaken. To test it, I blew air through it - I assume I can puff out about 0.5 psi. Air flowed through the valve towards the head, as expected. The reverse flow towards the crankcase stopped when the pressure went up a bit.Thanks!! Pictures below.
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Post by Scoutpilot on Aug 28, 2023 11:33:21 GMT -5
After I get it sorted and running, I will resize the lines. That's easy work :-) That will also serve to lower fuel pressure.
Is the single stage pump ok to use? This jeep has electric wipers on it. Should I put in a 9562 and hook up the vacuum? If so, can you PM me if you have one? Yes. A 9562 will allow vacuum augmentation for the motor. I will look in my cores.
From other posts from you, it looks like the spacer should be about 1/8 thick. Is that correct? Install the 5/16" fuel line with mechanical connections then check your fuel pressure again.
Just for clarity, this was not the port on the throttle body, it was the port in the head. Understood.
It was disassembled and cleaned. The spring did not seem to be holding the check valve tightly, it was a looser fit and the check valve rattled a bit if shaken. To test it, I blew air through it - I assume I can puff out about 0.5 psi. Air flowed through the valve towards the head, as expected. The reverse flow towards the crankcase stopped when the pressure went up a bit. A little rattle is OK. You'll know it's working soon enough when next you check the vacuum gauge.
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