Why is my fuel pressure high?

20

Asked by Jan 02, 2015 at 03:42 PM about the 1994 Chevrolet S-10 2 Dr LS Extended Cab SB

Question type: Maintenance & Repair

Pressure with engine off is 41 PSI but while running it jumps to 60 PSI. Volume test while running was also poor.

2 Answers

16,855

If it is a 4.3 it needs 55-65 psi to run. 41 while off indicates a weak regulator or fuel pump check valve

20

It's a 2.2. New engine, injectors, pump, filter, sensors.....basically this truck sat for 7 years and I've replaced almost everything under the hood. Blew out the fuel lines. Return line was clogged and blowing the FPR and causing fuel to flood the intake. Replaced the fuel cap today and it ran somewhat better. On the fuel test I ran, the pressure didn't drop until 20-30 mins later and dropped to 30PSI. I bought an evap canister filter and will change that out this Thursday when I'm off work. The only thing left I can think of is the actual fuel lines, or the pump I bought is faulty.

2 out of 2 people think this is helpful.

Your Answer

Add photo

Related Questions

  • High oil pressure 1 answer

    106k miles immediately after replacing head 9yrs ago my pressure tops out when driving but goes to 60-75% when idling. The car runs fine, its only driven when other cars are being repaired so only...

    1994 Chevrolet S-10 2 Dr STD Standard Cab SB

    -

    Maintenance & Repair

  • Why does my transmission lose pressure and slip out of high gears, when ambient temperature is low 2 answers

    I have flushed the coolant system.. The heater core is stopped up and therefore I have bypassed the heater core. My water pump quits for a short time but then continues to work. I discovered my ca...

    2000 Chevrolet S-10

    -

    Maintenance & Repair

  • 98 s10 with 4.3 vortec wont start 18 answers

    my factory fuel pump went out i put a after market inline pump on but it wont start

    1998 Chevrolet S-10 2 Dr LS Extended Cab SB

    -

    Maintenance & Repair

  • S-10 Fuel Pump Help 1 answer

    My fuel pump went bad so I changed that out, rewired the pump ...Now need to re-connect the three lines that connect on top of the pump. How do I identify which line goes where on the pump? What do ...

    2000 Chevrolet S-10 2 Dr STD Extended Cab SB

    -

    Maintenance & Repair

  • fuel pressure 4 answers

    my 99 Chevy 5.7 is running rich when I turn my key on fuel press goes to 100psi and stays even when running then drops to 57psi when key is off

    1999 Chevrolet C/K 1500 LS 4WD

    -

    Maintenance & Repair

Search Chevrolet S-10 Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Chevrolet S-10 Experts

#1 Andrew Olsen
Andrew Olsen
Reputation 2,130
#2 John Saffrahn
John Saffrahn
Reputation 910
#2 Trebor66
Trebor66
Reputation 910
View All

Related Models For Sale

Used Ford Ranger
228 Great Deals out of 7,053 listings starting at $1,200
Used GMC Sonoma
9 Great Deals out of 536 listings starting at $1,500
Used Toyota Tacoma
712 Great Deals out of 32,123 listings starting at $2,000
Used Ford F-150
3,218 Great Deals out of 205,090 listings starting at $1,779
Used Chevrolet Blazer
1,374 listings starting at $2,000
Used Dodge Dakota
128 Great Deals out of 4,388 listings starting at $995
Used GMC Sierra 1500
1,057 Great Deals out of 58,736 listings starting at $1,599
Used Dodge Ram 1500
527 Great Deals out of 13,261 listings starting at $1,800
Used Chevrolet C/K 1500
1,095 listings starting at $1,895
Used Chevrolet Camaro
475 Great Deals out of 39,921 listings starting at $3,499
Used Chevrolet Tahoe
854 Great Deals out of 28,369 listings starting at $1,700